I've never really been fond of using stimulants as "fat burners". I do however, find them to be extremely effective as a pre-workout boost and to improve cognitive performance while studying. For this reason, I tend to look more for stimulants which provide good clean energy without the jittery "cracked out" feeling that a lot of the "dirtier" stimulants on the market tend to provide.
My first dose of Adrenalean was the suggested 3 capsules, pre workout. I was quite pleased with my initial dose. I noticed a very clean stimulant feeling, with no jitters/anxiety. There was a significant mood improvement, but not quite the euphoria that ritalin or adderall provides. I felt pretty talkative (similarly to amphetamines), but was still articulate. It was reminiscent of the continuous blabbering that amphetamines tend to induce.
As far as a supplement comparison, I'd have to say that the closest thing on the market right now has got to be Gaspari's cytolean...in terms of mood elevating effects and energy. Although in my limited experience, I felt much more clear headed with the adrenalean.
With more experience, I feel that I'll be able to provide a more accurate review of the product. Stay tuned.