Use it about once a week as a motivator when I need to get work done, it helps with focus and concentration. Tolerance builds up quickly thats why I limit it to no more than twice a week, I've never taken Adderal so I can't compare them head to head, Modifinil isn't considered an amphetamine but it works very similar without the jitters and tweeking. It takes about 2 hrs for the full effects and lasts about 8 hrs initially but again tolerance develops and the effects drop off unless you up the dose. 200 mgs + 200 mgs of caffeine + 325 mgs aspirin + 600 mgs of choline + 500 mgs of phenibut = 2 cords of firewood split in a few hours and looking for something else I can conquer. Hope this helps...