I think creatine is one of the few supps out there that actually works. I use simple creatine monohydrate, or whatever they're calling it these days. There is a bloat factor, but I've found that it's manageable with water intake and diet.
One problem with it though is that many users expect AS-type gains from it which isn't going to happen. But as long as you take it properly, watch your diet, and keep realistic expectations, I think it's a good product.