We just bought two of these for our two children both age of three and over the height and weight criteria. We love how easy they assembled and how fast we are able to switch them from vehicle to vehicle. It was such a pain to use a regular car seat that did go up to 65 pounds to transition all the time and the price it was not very affordable to buy four. We love them and the kids feel like big kids and love how they get to wear a regular seat belt like mommy and daddy. The only thing is that for some reason it may be my vehicle that the back of the seat seems to sit lower in the seat and the...