Who uses Creatine

Do any of you guys take creatine, I've been considering it, and was thinking of starting it once I get back to lifting again. I've heard a lot of good things, but wanted to hear some first hand experences. I've been doing the whole workout thing for over two years without it, but thought it might be an interesting route to take now. I am looking to gain some size in my upper body, as I am getting close to my weight goal.