I think like many people, I was pretty skeptical of the claims the company made, however I am happy I gave it a try.
I'm really enjoying the effects: Crystal clear mental acuity and a gentle "come-down." I feel like a smooth-running machine, with no jitters and I'm massively productive and focused.
Just like any supplement, the effects will work for many and not all. Even prescription drugs state that it cannot be 100% guaranteed effective 100% of the time.
However, take them up on their offer. Make sure you take it with plenty of water and give it a few days of trial before writing it off. If you are sensitive to caffeine, take it with food to prevent jitters.
I have had nothing but amazing customer support and I think their offer is fair. I was charged less than a dollar for some kind of transaction test fee, but it was also immediately added back into my account.
Ignore everyone saying it's a scam. It won't (and they never claim it will) work for every human on earth, and they give you a fair shot at cancelling before it auto-renews (2-weeks). In my experience, just a few days was enough to know if you love it or hate it.
Anyways, give it a try, and happy productivity.
Bottom Line: Yes, I would recommend this to a friend