I just started Adrenaline and have taken twice. The first time I took one cap on an empty stomach and one 45 min later with food (I was assessing tolerance so I didn't take them at the same time). I didn't notice anything that great from it. Increased focus and a little energy but overall blah.
The second time I took 2 on an empty stomach (as one should) and had a great workout. Good focus and I felt very social. Because of the holidays, I had to cram 2 WOs into 1 and was there for 2-2.5 hours and I didn't get tired at all (great energy). After the gym, I felt a little cracked out until the effects wore off but there was no crash.
It seems like a good product for a cheap price and is similar to what I remember from taking the "old" AMP.