It seemed as though I'd increase focus, but not use it as well. Even worse, I'd typically be quite aware of my misused attention. Otherwise I tended to notice physical side effects like dry mouth and perhaps not dizziness but a sort of floating, poorly grounded sensation at times.

I used it for 3 months and stopped using stimulants for close to a year as a result. It works really well for some people, but threw me off fairly badly.

In any case, the active ingredient in these is the same, the delivery is just slightly different.