I just need to start by saying the seat itself is great. Install is amazing and easy. Other than that, the seat is not great. The crouch buckle is terrible and digs into my kids thighs. My 1 year old I had to move to the 2nd slot and my 3.5 yr.old is very petite and had to move to the 3rd slot. I also removed all padding to get a better fit. I just don't see this fitting them until they are booster ready. My 3 yr old also wanted to RF and has been FF in my car..so I decided to RF him, but there is barely and 1 inch of room when I bring straps below his shoulders. Seems like the slim version has more recline positions compared to this one. Overall extremely disappointed with how much I paid and would be returning it. I can't get proper fit for either them even after having a CPST look at. Extremely disappointed  I desperately wanted these to work.