I've been through three sets of the Scorpion Syncs on my 950SM and like them enough to stick with them. They work better than a street tire on dirt roads and stick well enough for whatever I throw at them on the street. I'm a retired expert level road racer, so while I don't ride that hard on the streets, I do have my moments.
I have heard tell that when they get real hot they get greasy, and they do let go if really pushed, but they do so in a very graceful, predictable manner.
I do a lot of dirt road exploring up here in the woods, and they work...well, better than a street tire I'd imagine, but they're no knobbie. As long as you remember what's under you and be cool, you can have fun off road. That kind of goes along with the whole bike, actually.