Very useful product: I do not like the idea that my little shell is attached with a simple seat belt (it moves a little too much for my taste and too afraid that the seat from slipping: s ) and there, thanks to the mounting system, it is clearly well maintained! Only drawback for me: the young profi plus (the shell) is quite difficult to put on and remove the fastening system (or so I am doing wrong, who knows: D) but given that the shell serves us as car seat, it's not a huge problem. I wanted her hull is established, it is! : D In short, I recommend :)