Very good - better than coffee :)
What it does: Boosts mood and energy levels. I noticed the effect within the first week. As with caffeine I wonder if there's a habituating effect - in that it's more stimulating at first, and while still stimulating over time, the effect is less noticeable after a couple of weeks, but still ...er...effective. [Sorry, apparently &#34;effect*&#34; is the only descriptive word I've got in my vocab right now.]<br /><br />Taste: Because I read that people complain about the bitter taste of the powder I got the extract, and find it to be very sweet, not delicious, mind you, but not bad.<br /><br />Which color/type: I chose the red based on my review of about 8 peer reviewed, science-journal-published, write-ups of studies. For your own purposes if you're trying to choose I'd recommend skimming abstracts on PubMed.
Rating: 5 stars