I Recommend the adams, seems to track a little better. I have 1 now, my girl is now 5, we spent the summer of 2002 renting 1. We drented it for a total of 22 hours, 1-4 hours at a time. My daughter would rather ride with me than any other activity. She truly loves it. I had a bad back from a work injury, I would not ride alone, I was too weak to ride more than 5 miles, but with my little helper I did 15 mile rides daily. Our longest ride was 40 miles, and she wanted to keep going.