I alternate between Modafinil and Armodafinil every couple years. They are both great. (not for ADHD but for my central and obstructive sleep apnea). I've been on it for over 20 years now. One of the coolest things for me at least, is I can take it in the morning, and stay up 40 hours, or go to sleep in an hour and wake right up when I need to. When I traveled all the time for business I would have a stop on every flight - 1st was about an hour and the 2nd was about 3 hours. I'd take my pill, drive to the airport, get on the plane and sleep, land, go to the next plane and do the same. Then I'd work a 12 hour shift once I got there. It is a wonder drug.