I've got 3 now (granted 2 are retired racers and are just rolling chassis) and raced one in a few XC/hairscramble races against R's and X's and it's my favorite trike, after the ATC110. The one I raced on was lowered a tad, port/polish, re chambered head, DG pipe, 36mm Keihin and it was a SWEEEETTTTT ride.

I think I'm gonna go to a 200X front end on one of these 3 I've got now.

The cool thing is is that you can throw an 89 YZ250 head and cylinder on one (as well as some other parts, not gunna make a full list) and then you've got a powervalve motor just that quick!!