Yeah, the most I've done is 150 mg. Oddly, it seems to make me feel more awake the next day, but also more zombie-like. It also seems to awaken me during the night. These effects are more pronounced on weeknights than over the weekend.

Last Saturday, when I took the 150 mg, I got this weird kind of buzz the next day. It wasn't fun at all. Then again, I think I was kind of sick before I took it, and I've felt the same buzz before without any kind of chemicals in my body.