I played with the seat at target today. It's an impressive seat. It's not as tall as the headwise (my 10 year old fits in the headwise, but not in the air70). The seat is really deep, but my 30 pound 3 year old fits perfectly with the crotch buckle in the furthest out position, so I don't think it's the seat for sensitive bigger boys. I put my skinny, 45 pound 8 year old in the seat. The harness was 1.5 inches above her shoulders, but there was only an inch of harness adjuster left, so it isn't going to fit wide and tall kids. I was also disappointed to see that it had standard latch. I hate standard latch hooks!