We like the cybex brand safety standards and the features but it was difficult to install because the straps just would not tighten down all the way. Definitely requires 2 adults and a lot of muscle. Other than they it's great. Glad we were able to get it to work. Also arrived quickly.

I was in the market for other cybex products when my sons car seat was lost by the airline. After 4 days with no word back about my child's seat being located in no way was a willing to sacrifice safety for convenience! That's when I ran across Eternis S with Sensor safe, being that my son is turning 18months it was the perfect option! Not to mention it was at my doorstep the next day which way amazing 🤩 ✨

More difficult to install than I expected. We drive a Mazda CX5 and the seats are not flat like the install video shows. Other than that our baby loves the seat. Very comfortable and feels safe.

Really cool car seat BUT I have some issues with the fit. When the headrest is in the lower position, it makes the fabric behind the baby bunch up, and pushes her forward. I could not find any videos or tutorials of how to make this comfortable. Also, the straps are very slippery and the buckles twist around a lot so every time I put the baby in the seat I have to sort it all out. Additionally, the buckle in the crotch area is really snug and does not adjust well. Overall, I don't love how my kid fits in the seat but it is a cool concept and the rotation is clutch.

This car seat met all our expectations and more! The design is sleek and gorgeous! -With its 360-degree rotatable seat, it's easy to get the baby in and out of the seat, while never having to actually remove the seat from the car. -This car seat easily grows as your baby grows! The Sirona S. accommodates babies from 4 pounds to 65 pounds! Many parents have to purchase an infant seat and then the intermediate seat, but with the Sirona S you can have the same one seat for years! -I love the anti-rebound design, which helps limit the movement of the car seat and reduces crash forces. Safety is the most important feature in a car seat and the Cybex Sirona S goes above and beyond in making sure our little ones are safe! If you're looking for an amazing car seat that's both convenient and super safe, then I highly recommend going with the best choice, the Sirona S!

I love this car seat. It is very comfortable for my nine month old daughter. She feels comfortable and spacious in it. It is convenient that you can set different modes for the headrest and the position of the child's body. I am happy with the purchase of this car seat!

In description shows that carseat is for babies from 0-10 but for my newborn its not fitting and I have to buy new carseat for newborn

I bought it for my grandson His mom loves app/phone sounds Very helpful

We needed to upgrade from the Cloud Q since we are about to have another baby. We're super happy with the Eternis S so far! Our 16 month old loves the little cup holder that he has now. It's obviously a bit bigger than the Cloud Q, he's still rear facing but he has more leg room since ther isn't a bar across the back of the seat anymore.

Excellent car seat. The rotating feature makes loading a breeze and it allows our child to see us better as we fasten her belts. The magnetic clip holders are a welcome addition.

I didn't realize how much of a blessing this would be when it was gifted to us. We absolutely love this car seat! It is comfortable-our baby boy actually enjoys being in it, it is safe-most important, and it is great for adventuring families like ours! The rotation feature makes it especially helpful when getting baby in and out of our keep wrangler. I would highly recommend to families on the go!

This car seat is so revolutionary & a back saver! I have a history of lower back injuries due to my career as a professional dancer. This design allows for me to safely get my baby into his car seat while not putting myself in a bad angle that flares up my back! So grateful for this product & design!

Wonderful car seat. I don't think I'll ever own another brand. Only complaints I have is that it didn't mention the seat comes with a cup holder so I purchased one, that I now have to return, and I wish the magnets to hold the straps back were stronger. One little bump from a wiggly baby and it falls off. But I love the compartments the straps are stored in and the seat just looks safe for my baby.

Sometimes it's hard to turn the carseat to put our daughter in it.

No other car seat compares. Purchased 2 Sirona S seats. Could not be more satisfied.

My third pregnancy killed my back. We purchased the Sirona S because of the awesome swivel feature. It is worth its weight in gold. My son is a chunky monkey and loading him in and out of the seat is so easy. I wish this product was out when my first two were little. He thinks spinning is a lot of fun too. We also love the SensorSafe clip as I often use it to make sure all is ok temp wise in the car.

It's truly the greatest car seat! We are so in love with our first one that we got the exact same car seat for our 2nd car. So easy to twist the seat to whichever side of the car you are on... makes mom life so much simpler. Cybex family for life!

I bought two of these seats, one for myself and one for my mother. My husband still has a "normal" seat in his car and is extremely jealous about how easy it is to get my two year old in and out of the car. I dread strapping my son into the seat in my husbands car. Do yourself a favor, get this seat now! It's extremely safe and so convenient.

The swivel ability of this car seat alone makes it worth it, makes getting your babes in easier and easier on ones back!

It was a tough decision. We were not quite sure which one would fit our needs best, but now we're very happy with that seat. Hope it keeps our daughter safe.

We are absolutely satisfied with the new car seat. It seems to be safe, fits perfectly and was extremely easy to install!

Got this car seat few months ago and absolutely love it. The baby feels comfortable and safe. The car seat looks nice and has great features.

It's so convenient. I will never not have a rotating convertible car seat. Thank you for making this.

The car seat is amazing and we really like it. It is difficult to get in and out of the car. I would recommend it for someone with one vehicle who is going to keep it installed for a long time.

TERRIBLE SERVICE TERRIBLE CAR SEAT. This car seat is not worth the money.

We had an issue with our first Sirona S but after contacting customer service, we were sent a brand new car seat at no additional cost and it solved the problem and operated better than the first one we had. It is tricky to install correctly, but worth it for us! We love the swivel, it makes it so much easier to get a cranky toddler strapped in, especially in a smaller SUV (2018 Jeep Compass). It is quite big, especially when rear facing, but we appreciate the versatility and the ease of changing the recline.

It is the greatest thing since sliced bread. This seat will save your back

Amazing carseat- love the features like the swivel and magnetic holder for straps to save time!

If you have a day to waste for installing this item then buy it. I followed instructions and the YouTube video and it's still not secure enough. It moves too much & I don't know why. I regret this purchase. The maxi cosi is detachable, secure and far less complicated! I can't easily move the cybex to any car because it so heavy!! I don't feel like my child is safe in this car seat! I only like the swivel feature that allows me to remove my child in and out of the seat easily. Just disappointed.

Love the features, the fabric, the look, and it seems like it's really comfortable. The problem is its size, it just barely fits in my car (a Kia Soul, not a tiny car)--I had to move it from behind the driver's seat to the passenger side so that I could put the seat back safely and now my passenger side is pretty squished. I read reviews that this was a concern in small cars but really it seems like it will only fit comfortably rear-facing in a very large vehicle.

Ok, if this car seat existed when we needed an infant car seat for our 5.5 pound preemie, I would have 100% gone with this option. At the time, I didn't know convertible car seats of this caliber existed. My absolute favorite feature is the SensorSafe chest buckle. Our previous infant car seat claimed to have breathable fabric, but every time I'd take baby out in the summer she'd be sweating despite my best efforts to keep the cabin temperature at a safe, comfortable range. I really appreciate the thought put into SensorSafe, telling me on my phone if baby is too hot or cold, has unbuckled themselves while we're moving, and I *love* that it monitors if the child has been left in the seat after the vehicle has been turned off! In my first months as a new mom, with fluctuating hormones and fears, I would have really appreciated a peace of mind feature such as this. The design also offers ease of adjustment to recline or not, which just makes life easier. We all know how difficult some seats can be to adjust from position to position, and I am in awe and I love with the swivel feature of this seat! We will have two children soon, and I've been really concerned with having to move the eldest to a rear side passenger position. The linear side impact protection devices give me a lot more peace of mind there. And we all know that the crotch buckles never stay in those pocket things so whoever designed a magnetic solution to keep these out of the way is a genius! The seat is easy to clean; we had a wash need on day three of use so we had to learn how to take this apart quickly. Easy. They really thought of everything. Cup hold being independent of the seat was also a super smart design choice. Also makes it easy to clean than a stationary cup holder. Cherry on top: our toddler is comfy and never overly hot when coming out. Falls asleep quickly and her neck is in a safe position at the recommended recline position for rear-facing. These are pricey seats, yes. Worth it, yes! When you look at all the safety AND convenience features in one package, and add up the cost of comparable infant seats offering the same safety features plus a second seat for when they outgrow that, it's about the same as just having one really incredible car seat like this one. We are seriously impressed and buying another for our second vehicle. Thank you so much to the Stellar Product Testing Panel for offering this seat to us to test out!