Yeah. It rocks, under the right circumstances. You don't get strung out like you do on amphetamines, but there is a bit of a "crash" at the end.
I don't take it often, as it's pretty expensive. I use it for three things:
1) when I travel overseas for work, and need to fight extreme cases of jet lag (i get it *bad*). I take 1 pill first thing in the morning, and maybe another one around lunchtime.
2) I have some sort of work deadline and I need to work very late or pull an all-niter. With this stuff, I can stay pretty much sharp as a tack. You do feel a bit weary, but you can *really* concentrate and get stuff done.
3) I want to be a little *extra* pumped for an important meeting/interview. I'll take 1/2 a pill an hour before hand.
If you keep taking the stuff every 12 hours, you could easily go a few days w/o sleep. Downside is that when you stop taking it (after being sleep deprived), you'll sleep for 12 hours and feel headachy the next day. But if you have some sort of need...like a deadline...nothing like it.
Oh, your piss will smell like drano. don't be surprised.
