I have ~1000 200mg pills laying around, I use it 3-5 days/week depending on what work looks like. I LOVE it. Had to go to Vegas a couple weeks back for work, late flight and ended up getting to the hotel at 2 AM. Had to be up at 6 AM. Pop a modafinil, chug an ice water, good to rock. A coffee an hour later helped but modafinil is king.
How many hours do you feel the effects of it?