First off, if you're sensitive to caffeine (as most of the people giving negative reviews obviously are) then you may want to go easy at first. The first time I took this supplement, I took the recommended dose of 2 capsules, after which I was shaky and felt very strange for about an hour or so.
The second time I took it I lowered the dose to one capsule and I could feel the rush of energy without the shakiness. After about a week or so, once I felt that my body was getting used to it, I increased the dose back to two capsules. I haven't had any issues since.
You pretty much have to eat with this - otherwise you'll feel very jittery and possibly have a bad experience, but if taken correctly I believe that this product will work wonders. However without proper diet and exercise you're probably not going to see the results you want just from taking this product alone. It's not a miracle pill, nor does it claim to be, but the burst of energy you get with it is awesome and can really give you a boost before a good workout.
Bottom Line: Yes, I would recommend this to a friend