I've read several write ups about them. Going from what I've read only, they do decent in the mud and work pretty well on the trails. To me, they sound like a tire that do a good job getting you from mudhole to mudhole, as long as the mud isn't to bad.
Mud: As long as it isn't to thick they do good. Otherwise will bury up. They like to dig.
Trail: Best tire for any kind of trail if you ask me. I have rode on mudlites, 589's, and I like the lites the best out of those.
Ride: Smooth and grip real good.