the old xenadrine was the shit, ill agree. the new hydroxycut SUPER hardcore is even better though. but the gaspari stack is SO MUCH better. but alot of people get of on the energetic, shaky feeling from ephedra, and the gaspari isnt like that, so many people think it isnt working, till three weeks later when they've lost ten pounds.
Rev XP is a good fat burner, as is ThermoDynamX. I've used those two brands over the last few months. I was taking ThermoShred, but the last week, I was feeling nauseous. When I stopped the ThermoShred for one day, the nausea disappeared. I can deal with the itchy scalp stuff, but a tummy ache isn't good at all. The bottle warns of abdominal discomfort, so I may back off for a while.
In the mean time, I've switched to Hydroxycut Hardcore. Right now, I'm on day 3, and I'm taking the product as instructed on the "tolerance" chart. From what I've read about HH on other supplement review boards, the key things to watch is jitters, possible lack of sleep and red bowels (from the dye).