I've been using a Totalee frosted clear case for a couple of months now. I like the fact that it's super thin and doesn't really change the overall form of the X, but after pulling it off today, as I sit at my desk, I'm reminded just how good the X feels in hand without a case on it. Not sure I can live without something protecting the back glass - especially given the fact that two months in and my screen has several significant scratches (that I'll get fixed at some point through AppleCare+).