Started using Fuzu after having used Tribex (old version). Not too much difference in effects - increased libido, etc. - I did notice an increase in appetite on Fuzu that I didn't get w/Tribex. Since I'm still dieting (was VERY overweight when I started all this), this was actually a drawback. BTW, I'm 39 - general consensus at my gym is that us older guys get more impact from tribulus products.
The only thing I hated was the maple syrup smell - Big Kahuna wasn't kidding about this. It's noticable in your sweat after a while. I actually had someone at the gym comment on this - she didn't know it was me, and actually walked up to see if the guy at the front desk was eating pancakes or something. (Hot/humid day, air conditioning off, on thermogenics, and when training I sweat profusely even in the dead of winter!) I have one of those plastic multi-compartment vitamin cases that STILL smells like Fuzu even though I ran out of the stuff over two months ago. Strangely enough, I now have the new version of Tribex and I also get the appetite-stimulation effect from it.