I am extremely passionate about all thinks car seat. This seat is so easy to install and so easy to use. Quality fabric and very compact front to back. I've been able to use it rear facing for all three of my kids aged 1 to almost six. Super high rear facing limits and great leg room (even though legs are safer rear facing anyways). I read the other review about the chin to chest kid and there won't be any issues if you install it properly and have the child restrained properly. Www.csftl.or is great for a detailed review and I found regarding proper car seat use.
I liked the extension idea so my son would be able to use it rear facing for longer. However the from the first use all he does is cry as he is very uncomfortable. He is almost 8 months. His head is pushed too far forward. His chin is on his chest. I tried to reposition him but it's impossible to make him more comfortable. Unfortunately I am going to have to return this.