I used it for a quite a long time, going to go back on it when my weight training picks up again. Saw pretty good gains using it.
It's great if you know what you're doing with it. I've always used creatine monohydrate, it's good and cheap (most of the studies regarding creatine use the monohydrate form). If you opt to not use monohydrate and use some other form of it, you'll need to look up "creatine loading" (if required).