I gave the Performix SST 4 of 5 stars because I don't feel it burn fat but it gives me the energy to go out and do fat burning activities.
First off, do not take any on an empty stomach or after just waking up. Eat breakfast an hour before taking and two hours after waking up otherwise you might shake and feel some acid reflux.
When I take this product, I feel like the world is a better place. I've posted on several review sites because of how much I love the product. During the summer, current at the time of posting, I play volleyball five days a week, work 50 plus hours and maintain a decent sex life (three times a day, five days a week).
I did not lose any weight for the week I took the pill and didn't change my habits. But when you take this product you are filled with enough energy to go about your day and add fat burning activities. I'll go for a run after volleyball or after work and before I get back to the girlfriend. Also, the immense amount of focus it gives you is the best. I swear by this product but when taken the way I suggested versus how Performix suggests taking it.
Bottom Line: Yes, I would recommend this to a friend