I bought this car seat to replace the chicco keyfit. Both carseats meet or exceed safety standards so i will not be reviewing safety.

I decided to replace the keyfit bc
1. Fabric in keyfit is thick and not breathable. My 2 mo old would sweat like crazy in the seat.
2. Keyfit was heavy and bulky. Carrying it around was cumbersome bc of the size It didnt fit my travel system stroller very well
3. Keyfit didnt quite fit in the back seat of my mini clubman. It was avery tight squeeze.
4. When i put my baby in the seat, she sits deep in the seat and often times, slumps, even with the infant insert. The way most car seats are desined, this seems to be a common problem

This review is based on my experience with both car seats. What i liked about the cybex:

1. Fabric is lightweight and more breathable. Granted my baby is still Hot when the weather is warm, she doesnt sweat as much.
2. This car seat seems lighter than the keyfit. When... Read more

We went with Cybex because it has been highly reviewed. Overall we are very happy. The fabric removes so it can be washed and it is easy to clip and tighten. We also like that the seat integrates nicely with the Cybex stroller. The seat base is easy to install and makes putting the seat in a breeze.

The only criticism is that it can be tricky to detach the car seat from the stroller since you have to push up to thumb latches on either side of the seat.