I'm running them on the SV, and they're magic. I ran Sportecs before but these are better in the wet, better when cold, reach and stay at operating temperature faster, and the only place they're substantially worse is in straight line power and braking. The do spin up in the wet more easily because of the slick central part, but it's always controllable and consistent. You get a little less feedback when pushing, but not so much that it's a problem.
Don't know yet how long they'll last, the rear's seen 6000 and still looks OK, and the front was changed off for a 120/70 Roadtec when I put the GSXR front end on it- it had loads of life left at 5000.
I don't plan to take them to a trackday again, they were the limiting factor for me, but since I save 3 rears and probably a front and a half every year over the Sportecs, that's enough to pay for a spare set of wheels with track oriented tyres!
Obviously an SV's not a sports 600 and you'll eat rears faster, but I've been nothing but impressed with them.