I've only tried the generic Modalert (india based pharmacy)Out of 30 pills I'm not sure I could really feel anything. I tried 100, 200, & 300mg doses and still never felt much, if anything from them. I tried taking them 1st thing in the morining, empty stomach, full stomach, w/ caffeine, Lucidrol etc. didn't seem to make a difference. Because I do shift work, I should be able to get an rx from my doc for some real Provigil or Nuvigil. I'll report back if I do. In the mean time I ordered some Super Stim because caffeine just doesn't do much anymore.