l-creatine

My doctors are pretty neutral about whether or not I try l-creatine. So I thought I would ask and see if anyone here has tried it and what they thought. Also, I read that it is primarily used in those with myopathy. Is it supposed to help with brute strength or endurance? For instance, if it helped me would it enable me to hold my head up longer or would it help me do something like a single push-up?