I'm fairly resistant to some stimulants, so my dose for this is two tablets about half an hour before my early morning workout. (Three makes me sick; two is fantastic.)
This has a really nice affect, giving me wake up energy with just the mildest of jittery feeling. What's really cool is that the energy comes in a couple of mild waves, so when I'm about 15 and then 30 minutes into a workout, it's really easy to re-focus and almost start fresh. I've never experienced anything like that before; ordinarily, I sort of go on auto-pilot and continue the workout with discipline and effort, and this stuff helps me continue with determination and a marginal increase of strength.
We'll see if my tolerance builds up, but just a few days in and I'm completely sold on this.