Yes, I gained 100lbs of muscle in 3 days!!!!
sorry, just had to be a little sarcastic.
It's a mineral supplement. I'm sure you take a multi-vitamin right? Those are what 10-20 bucks for a month? Well, this is a specialized mineral supplement. It's key since most regular exercisers are low on zinc and magnesium and these minerals are related to testosterone levels and performance. You can read more about it in the thread itself, but I'm sure you haven't measured and "results" from your multivitamin yet continue to take it right? ZMA is like that, you can just assume it's helping you out.
I have noticed that I sleep better and deeper. And if you sleep for a long time, say 12 hours, the dreams are crazy imaginitive and vivid.