So an honest opinion from someone NOT trying to sell skis:
Grippers are the best ski for an XM Doo. My buddy has Mohawks, aside from them being one of the ugliest skis ever, they will KILL your arms after a long ride. I rode my bud's 174 with Mohawks, I didn't go more than 100 yards before giving the sled back. (We had identical sleds other than the skis.) The steering effort was ridiculous, in deep snow. I have had Grippers on my Doos for the last two years, aside from wearing out rubbers every 4-500 miles, they are great. And half the price of Mohawks.