All positive experience here. You must make sure to use it effectively. Also, make sure you are buying creatine monohydrate powder, and not expensive dextrose mixed with some creatine.
Works best for me 40 min after workout, after I've eaten some complex carbs and meat. I use 10g/serving 2x a day.
Don't forget, creatine really works for strength and endurance. Most pro bodybuilders, powerlifters, and runners are using creatine as part of their nutrition.