I have tried just about EVERY N.O. product on the market, at one point or another. There is probably only a small handfull that I haven't tried...I am not saying that they are a great investment...I think I am just a glutton for punishment.
That said...some of the best I have tried, and would actually recommend, are Labrada's Charged, (probably the best overall), Superpump 250, (the best in terms of mental alertness), and SAN put out a non-caffiene product that worked great.... cant remember if it was called "VAULT," or if it had a different name.
The rest were rather mediocre.
M!