I think during the fall, I only let my 13 year old son ride around the school parking lot, and that was pretty much it, because all the other times my wife wanted to ride with me.
So Saturday was his very first unfettered freedom on this bike on the bike path. He weighs about 110 I think, and I weigh in at a solid 280. While he was using twist throttle, I had to pedal as fast as I could in PAS5 just to keep up with him! AHhhhhh the weight factor. It was really interesting to experience.
After our ride was over, he said to me "Dad, there's really NOTHING like that feeling in the entire world, it's just so amazing I want to keep doing it over and over again forever!"