The Enema is pretty good in slop, but when the going gets funky, wider is better. If you have never had a fat ski, get one, no other ski will change the way you look at hill, like a fat. Yea, the Mach is definitly quicker than the Enemy, but the Enemy has bigger platform. They are both really playful, fun skis in there own way. Both bump really well, but I like skiing a mid fat better than a carve ski. I spend most of my time off piste, that probably has something to do with it. If you are more into the groomers, a Mach/Enemy combo would work quite well. The Enemy is a total blast in pow, crud, junk, Etc.. But a fat just rules off piste. My advice get a fat, and get off those groomers. I trained about eight instructors who passed level 2 last season. Most did it on mid fats (Enemys actually), others on carve skis. Probably did not make a big differencein the exam, but thier free skiing? Wider is better. Here in Mammoth most people go with a midfat(twin), and a fat as thier quiver, but lots of Euros and Aussies dig the shorty slaloms (probably shows how much time they spend on manmade).