The Graco Nautilus seat has some great qualities. For instance, it goes from a five point harness system, to a booster with a back, to a backless booster. It will grow with my son which is why we bought it. However, he is always complaining that it is uncomfortable (he was in a Britax before). The other negative feature is the buckle for the harness. It always flips toward the back of the seat, and my son ends up sitting on it when entering the seat. Then we have to fish for it. That gets very irritating for all after the fourth, fifth, sixth time.