From personal experience, you definitely will have withdrawal from 7-OH after you have been on it for some months. It was good for an afternoon pickup, but pretty soon tend to use it several times a day. When I decided to quit, I had anxiety and insomnia. Not terrible, just enough to be aggravating for a few days. Plus the stuff is kind of expensive. There may be good legitimate uses. Maybe best to stick to plain kratom for a boost rather than this super potent derivative.