I tried the Michelin XC/AT and it sheds mud well, but my rear tire slipped 3 or 4 times (very minorly) in an hour's time which was kind of dissappointing, so i let out some pressure and it didnt happen again... the only place i slipped was on very dry red clay hardpack so thats proabably why... they are great in central VA mud... and roll pretty fast
edit: i forgot to say, yesterday I got a flat (running tubes) on my front casue I was going around the block with my mom to check out her new tires I put on her bike and I f-in hit someone's sprinkler without noticing (about 28psi) and it jarred my pretty hard and within a block I lost all air... just saying... watch out for sprinklers