This car seat is definitely sturdy. It feels solid and it's weight would suggest that it should be solid. It is the heaviest car seat we have ever owned.. We bought two for our twin grand daughters and there is actually room between the two for the ten year old my wife watches too. This was not the case with the two Britax Marathons that these seats replaced. We like the fact that the life span of this seat is ten years which will get us to the point we won't need them anymore since our grand daughters are three years old. We were a bit reluctant to purchase the light colored seat covers but the savings made it an easy decision. We sprayed the covers with fabric protectant to hopefully extend the time they look good. We expect these seats to serve us well.

The car seat gives me so much more space in my small car. It is a little heavy.

This car seat is perfect for fitting 3 across the backseat. I am able to fit it, an infant car seat, and a toddler car seat in my car. It's heavier than I realized, but super easy to install.

I love this seat. We can get three of them across in my Prius.It's solid, and heavy, but ever so comfortable. My son at age 4 is still comfy rear facing.

We bought this carseat for our second car - a 4 door Honda Civic. We needed something that would fit in a relatively small backseat, and the diono radian is perfect! The installation process was fine (my husband did it). What I really like about it is how easy it is to buckle my son into the seat. We have another car seat and the straps on that one get twisted around and it is difficult to tighten. The straps and connection on the diono radian are a breeze. I highly recommend, and wish we had one of these in each car!

Great for my Honda Civic. At first it took a bit too figure out where I'm going to place, but after a few times playing around, I got it to fit. I also ordered the foam that goes underneath so the seat is more upright. This way my husband can drive as well. My 7 month old seems to like it. It is heavy but at least it doesn't move. I will be purchasing another one for my 3 year old daughter as soon as I find a sale.

I searched for a carseat for my 2 year old when I discovered we were having twins. We have the Diono in the middle and a Chicco key fit 32 on each side. We use latch for the infant seats and the seatbelt for the Diono. It works well. This is a good carseat. It is sturdy. The low profile is great too. My kid can easily get in and out of the seat when in the car. The straps were a little tricky for my husband, but we got it.

We are very happy with this car seat, obviously the cost is up there, but for a family that needs to fit 3 carseats it works perfectly whereas traditional carseats do not work. I am very impressed and will definately recommend this product to others.

We liked this carseat because the sides were low enough to more easily put an 18 month old in and out and its more narrow than our other carseat that we are using with it. We're pleased. It was a good choice for us.

Ater doing a lot of research, I chose the radian r100 for a cross country flight because it is narrow enough to be wheeled down an airplane aisle (even the small Embraer jet we took for a regional flight from newark to Toronto), when strapped to the britax travel cart (basically a luggage cart onto which you attach a convertibe Carseat using LATCH clips). The last thing I wanted to do was carry a heavy, bulky carseat down an airplane aisle while waiting for people to finish stowing things in the overhead compartments. It was unbelievably easy to install in the airplane forward facing. it has a very tall shell (so your child won't outgrow it as quickly as he would outgrow other carseats), so it is difficult to install rear facing unless you buy the $10 Angle Adjuster (big square of foam). The R100 is sturdily built, extremely safe with a steel alloy frame and has a low profile, so it is easier to get my baby into and out of this seat compared to our Britax Pavilion (which has a high built in base). I ended up making the Radian the primary carseat and putting the Pavilion in my husband's car.

This is a great seat, feels very sturdy and safe for our daughter. Easy to install, easy for travel, and with some minor adjustments I can use as a harnessed seat for all three of my children, ranging in age from 14mo to 6yrs. :) would purchase again if I needed another.

love the seat itself, its easy to get baby in and out, my son seems very comfortable in it and i LOVE how trim it is in my car. But getting it in the car rear facing is a pain. its hard to tighten the latch system and get it in there snug. plus its so heavy that adds to the tricky install issues. Switching from RFing to Forward facing is a process in its self. This is a great seat, but if your planning on switching it between cars often, i wouldn't recommend.

It's slim and that is what we needed. I think that it is a little overpriced, but you can't find another slim car seat anywhere else! We like it

This car seat was a lot easier then I thought it was to install. I love it so does my granddaughter.

Purchased first Radian for its slim profile-to allow for more room for booster seats for older grandchildren. Purchased the second for the same reason for another vehicle. Very satisfied.

The Latch system does not click into our Land Rover. After contacting the company, they informed us that an adapter would be necessary and they shipped it at no charge and it arrived about a week later. Just a little inconvenience if you have a foreign car!

I bought this over a Britax (which I'm OBSESSED with) because I need to fit three convertible carseats in my BMW X5. I currently have a Britax Advocate and a Britax Frontier and all I can say is the Diono Radian is just as amazing!!! They advertise being able to fit three of these in the backseat and even having the two Britax carseats, it still fits. The straps are heavy duty and don't twist. It's also very sturdy and comfortable for my 17 month old. Love this carseat! If definitely buy another!! Albeebaby is the only place I buy any of my carseats because they beat every single competitors prices. Ships super fast and I love the free shipping

I can't believe how much I like this seat! I thought I'd never find anything I liked better than the Marathon (we have two), but I like this one just as much, if not more. I needed this particular seat due to its narrow profile for three-across, and it's a perfect fit. RF belt install was a snap, and getting my 1yo in and out is super easy - no issues with straps or buckles, and the low seat profile is awesome. I did buy the angle adjuster in order to give the front passenger more leg room - which was definitely needed - it would have been uncomfortably tight otherwise. It's amazing how much difference that makes. Great seat at a great price. I'm thrilled.

Great safe design, and we fit 3 seats across in our Corolla.

After doing quite a bit of research for car seats for my twins, this seat was the one that had been identified as being the best for multiples. I can now see why! This seat is not only great for having 2 car seats next to each other, but all easy and comfortable for the twins. I have a 2003 GMC Yukon, so the seats have to be next to each other. The first 2 that we had both (Britex) were so bulky they barely fit and was concerned about the stability if we were to be in an accident, I now do not have those concerns. A great buy indeed! I was also impressed with delivery. Got both within less than a week!

Perfect seat for my car. I am a grandparent who transports three little girls, so I have three car seats in my back seat. This seat is narrow and very safe . It fits perfectly in the back seat with the other two.....would like to buy two more so they would all be alike and give us a bit more wiggle room in the back seat.

I was looking for a seat that would fit in our truck (Dodge Dakota Sport) which has a very shallow seat in the extended cab. The Radian fits perfectly, and very securely. I'm so happy with it that I'll be ordering a second for our Honda Fit.

Quick shipping, quality product! When our second little guy was ready to transition out of his infant bucket seat, we researched a couple less expensive seats. But we realized we were so happy with the Radian we already have for our first son, we got a second one. Solid construction, skinny width, high back, converts to booster... we plan to keep these seats until the boys transition out of boosters/car seats altogether.Is crazy heavy, but that's a safety plus as far as I'm concerned. Really like that the back of the seat houses all of the different attachments to make this seat work in different configurations (LATCH, standard seat belt, non-locking seat belts, etc.). Easy to run the shoulder harness through the back of the seat.Highly recommend/

This is a great car seat if you're looking for a narrow one. It was easy to install and we fit 2 Radians + one Graco infant carrier seat in the back of a Nissan Altima.

This is an amazing carseat, easy installation (took me about 10 min), and for the price on this site it really is a steal

The carseat is great, it's exactly what we were looking for, a slimmer and safe carseat. My only complaint is that it is really heavy. Although we love the fold up functionality, the weight of the carseat makes it cumbersome to travel with.

This seat was easy to install. we got the angle adjuster sine it is for my almost 3 yo she doesn't conplain and she loves still being able to ride rear facing!

We actually already owned one of these seats and liked it so much we purchased a second one for our second child. It fits easily in our SUVs, and it has a nice narrow profile, making it possible to carry an adult passenger next to it, unlike other giant seats we've owned (Britax). Unlike our first one, we installed this sear rear-facing and I can't WAIT to turn it around. The strap you use to tighten the harness is nearly impossible to reach when the seat is installed rear-facing. What a pain.

It was very easy and convenient. I kept going back and forth on purchasing a carseat online and you guys made it very easy. I have 3 across in the back of a 2001 Honda Accord and knew with my infant this would be the only seat that was going to work to keep him rear facing.

I didn't know about the price when I purchased this seat, but it was my best bet to fit the 3rd car seat in! I am VERY HAPPY with the seat. I will probably buy another one when I need to upgrade a current car seat.

I bought it as a gift and my son-in-law installed it the same day we received it. He raved about it and loved it so much that he ordered another one for their other vehicle the very next day!!

Very good. My son, who is HUGE! for 3 fits great in this seat. He's had it since he was 1. This was called the Radian Sunshine prior to the company name change. His twin sister, who is signifacantly smaller, needed and upgrade and this is the seat we purchased for her. Very much like his sunshine radian. Gives extra room to fit a grandparent in between the seats in the back, which you couldn't do with their britax seats.

I ordered 3 of these because most are bulky and won't fit 3 across even in my van. I have 1 year old twins and a 3 year old and they all fit 3 across, even with 2 turned around.

Purchased two of these seats for my daughters- the price was the best I could find and the shipping was incredibly fast. The seats are sturdy and slim, two must haves in my search. The seat base is also much lower, so my tiny 3 year old doesn't have any trouble climbing up on her own. I haven't used the shoulder strap path feature, but the 5 point harness is great. I have 2 Britax Frontiers and the strap material on these is much more heavy duty- I haven't had trouble with it twisting at all. We don't have LATCH in our older model van, and I had no trouble installing them with the seat belt. I am very pleased with my purchase and would recommend highly.

Our son is very comfortable (still rear facing) in this adaptable seat. I highly recommend it. It is pretty heavy so I don't know how much we will use the airplane/transport function, but in our cars it is wonderful.

Thanks to this seat as well as the Combi Coccoro and safety first air seat I was able to fit 3 across in the back of my 2012 Kia Optima!!! The seat is so compact and sturdy! My daughter also commented on how comfortable it was!!! Albee baby had it at a great price with FAST shipping!!!