Every few months, once things start to get a little too wookiee-like, it's not a bad idea. Start with a trimmer, though -- preferably one with a guard on it, if you have to go the beard trimmer route. Doing the full shave may lead to ingrown hairs, and just itches like fucking hell after a few days. Haven't tried an epilator, but I am intrigued. It can't be any worse than feeling like I'm wearing a codpiece made from a cactus for a week and a half.