I too have used creatine several times, when i've been on a rough workout routine. It works very good for me and i have not had any problems with it. there's a lot of rumours floating around about creatine. Theres a lot of people who see it as close to stereoids, which is of course, stupid.
I use proteinshake, with no carbs, and an occasional gainer , with carbs, after workout. I did creatine a while ago and had no problems. Given, i\d only recommend taking it if you are working out alot. It is rather tough work as you take it alot in the beginning.
heres a good article:
Creatine: Side Effects, What It Is, What It Does - Men's Health