Yep i have seen (and had) some of this stuff before. it was ok, not brilliant. I try and stay away from the wizz so i can't really tell you much about the effects, but when compared to the brown rock that's doing the rounds of melbourne at the moment, i would give it a 7/10. It didn't have any bad effects but i stayed awake for AGES after the initial buzz wore off which makes me think it was a bit methy. Plenty of energy and alertness that you get with most speed though.
like you said it's kinda wet (has that pastey appearance), bright pure white and sorta crystallised. good luck, party safe