These seats are great, My wife has one in her car (Clio '09) and I have one in my car (Insignia '12). They clip in securely to the Isofix anchor points and with the top tether are secure and won't submarine in an accident. Supplemental support can be given by using the car seat belts. The seats are comply as our little one (now a 12 month old) falls asleep within 5 minutes of being in the car, Head support is given with cushions either side of the head as well as given support during impact I guess, the angle can be adjusted a little (maybe a little more adjustment may have been good) to put the seat in a slightly more reclined position for sleep. . The seats don't rattle at all as one person commented. The only down side I would say is the manual can be a little difficult to follow, however after working out how to install the 1st one the second was a breeze. The seat even comes with Isofix guides which clip onto the the anchor points to help you locate the isofix clamps into position. I'm happy and would buy another if I needed one!