I've been commuting fixed for 5 years - I really like it. Fixed gear riding involves another whole set of cycling skills that is fun and interesting to master. I have two brakes; I try to ride like I don't have any brakes, but I'm not shy about using them when necessary. Shifters and derailleurs can get gunked up with rain and road grime on a commute bike and I like not having to pay attention to that.