I've been away from all the forums for a while, but I thought I'd throw my review on here. I think I've become somewhat tolerant to the effects of the Alpha-Yohmbine, but it is still rather effective.
Being that I'm a caffeine addict, who is continually in forced withdrawl when school is not in session (I stop drinking caffeine to bring my tolerance back down to a reasonable level before the next semester), I do have to admit that it is no caffeine replacement. Nothing brings me back to "normal" like a cup of tea.
Nonetheless, the A-Y does a good job of potentiating other stimulants, and as others have mentioned it almost has a paradoxical smoothing effect on stimulant like E and C. I love the A-Y for fasted cardio, it is definitely a staple supp for me in that regard. Unfortunately I havent had a chance to test its purported nootropic effects, as I have been spending more time drinking than working. From my day to day experiences however, I can imagine that A-Y + Nicotine lozenges would be an amazing combo for doing work, especially with a bit of tea on the side.
All in all I think its a worth while supplement, and am happy with my purchase. When I get home from vacation I'll do some side by side comparisons of A-Y to plain Y HCl to see if I really like the A-Y significantly better.