Very addictive, and very hard to come off of. I don't like the idea of taking anything that I can't drop instantly if problems should arise. Also, if you have an injury, it will make the pain, leading to a worse injury. I remember one guy who used it, and he may have been full of shit, not sure, but he claimed he got hooked so bad that he lost all sense of touch. Like I said, he might have been full of it, but if he wasn't then holy hell!