The eph. free xenadrine may work for you due to the fact that it may give you more energy, to do more at the gym, thus more results! other than that it really dosent compare to the old stuff, or an e/c/a stack.
As far as NO2 goes, I tried one 21 day bottle, and it did seem to give me more energy, some pumps, deff. a few stiffys, some strength, and a good overall feeling of well being, but with me the real change was after i finished it, I deff. noticed it more than when i was on it, I lost minor strength, and didnot feel as good overall, I waited a week and just started a 2nd bottle, so my opinion is that its a good supplement but way over priced!
My roomate in college used the ephedrine free Xenadrine for 6 weeks and lost 8 pounds. He was a 300 lb monster. He did hit the gym HARD with me. He did tell me it gave him more energy. He said he had some minor sleeplessness. I personally stay away from stimulants....got a arrythmia as it is...hate aggravating it.