Yup, creatine is a good thing!
Before I decided to compete in BB, I was into powerlifting (as a hobby, not competitive) for a bit. At 125 pounds, I got my 1RM raw bench up to 130 with the help of creatine. It definitely helps makes you stronger.
I fully agree on "don't take more than you need" or if you do, limit your dosage to 5g/day. When I first tried creatine, I did the "loading" method of 20g/day every day for a week and uh... well... let's just say I felt like I had Montezuma's (sp?) Revenge
Creatine does cause your body to retain a tiny bit of water, BUT it's water in the muscle cells (instead of under your skin), SO it doesn't show as bloat unless you are using too much.