Maxxis Desert IT seems to be a long wearing tire. I have not tried one on my 500 yet but it will be the next tire to go on it. I have them front and rear on my 250 but I would like to try out some other fronts. Also don't confuse the Desert IT with the standard IT if you decide to try one out.
Oh I should probably mention I do most of my riding in the high desert of Southern California which is rocky, sandy, silty, hard pack, rocky and rocky. Well, if you like looking for rocks.