I've been on a 450 sinse 2004. I don't think I'd ever switch completely, but I have been kicking around the idea again of getting a cheap 125 to play around on. Rode a friends 250 stroke last week for a few laps, and had a blast. I'd get hurt riding the 250 though, as I'd prolly expect it to do everything the same way my 450 does. A 125 is so slow, I would without a doubt know better.