I used about two bottles of phenylpiracetam (80 X 100 mg). I had impressive results for about two weeks. I was very well organized on it, something I'm really not used to be. To have any effect, I had to take about 300 mg at a time. The effect is very short (2-3 hours). Then, it stopped to work suddently (on a Wednesday to be exact!). My adhd came in full force. During those two weeks, I had a clear goal to focus on at work. When this job was over, I came back to my general confusion and the phenylpiracetam was hopeless is this situation. Well, that's my theory.
I think that's it the most stimulating nootropic. It's a clean energy, different from amphetamine but somewhat related, but I'm not sure it worth the price.