I have a non-R that's been on the track once. The suspension is a little soft for all out at my weight; but it gets the job done reasonably well.
As far as clearance issues; i've yet to scrape the pegs and there's been a few points where I could have put a knee down with minimal hang off. Well, I lied. I can scrape a peg (found out the scary way) when hanging off turning right, going down hill at the front of my neighborhood.
Compaired to a "sport 600". They've got a little advantage over me. Better brakes almost always and usually adjustable suspension. But at the end of the day it's going to come down to the rider. The hardest part about the Striple for me is it's love (any mine I guess) for wheelies in 1st and 2nd.
Here's the chicken strips form jusy daily driving and back roading...

I've already sqaured this tire off so I'm trying to take it easy on it.