I've ridden one at Fox Valley Offroad and it's an awesome bike! I only did some laps on the MX track, but really wish I took it into the trails, because that's where I think the JR would have really shined for me. I'm 5'6" (on a good day), and have been racing 250F's for the past 5 years (also spent 4 years on 125's and 1 year on 80's). On the MX track, I did find the size of the bike to feel small compared to what I'm used to, but the bike was amazing in the corners! A lot lighter and smaller in the air than a 250F so it just felt different. If I hadn't been on a big bike for so long, I think it would have been even better, as the power was solig, and I could actually touch the ground and lay it over in the turns! Again, I wish I took it in the woods, because I've tried a few HS races on a 250F, and would much prefer a smaller bike in the trees!