Yeah, I've done the 20x several times. There are much better legal highs out there.
It smells like butt and tastes similar (not that I have ever tasted butt, but that's what I imagine it'd be like). The majority of effects I got were a weird gravity sensation pulling me down and slightly to the side, and pushing down on my thighs. The same/similar effects were experienced by my friends.
One time, I slipped into a universe where there were two yellow lines converging on my forehead, but that was just for about 10 sec and was rather boring. But that was the single interesting exception.
EDIT: I did it smoked dry and through water.
I tried it a few times about 2 years ago and had a similar experience. I still vividly remember the awful taste of it as well, each time it only took me one big milky hit to feel the effects. I smoked it out of an ice-catcher bong. My most memorable experience from it was a sensation of being in a tunnel that was spinning around me, the tunnel led to the tv, where the news reporter seemed like he was talking directly to me. After this I felt like I was travelling to alternate realities, and began to get anxious because I felt that I wasn't sure what was real, and what wasn't. I too also got the weird feeling of extra weight on my thighs, and upon coming down, felt like i was being pulled into the chair and couldn't get out. After I came down completely, I felt terribly burnt out for the rest of the day.
If you plan on trying it, make sure to keep a few things in mind.
- DO NOT, under any circumstances, smoke it while you're driving, I could almost guarantee you that you would get into an accident.
- Make sure you're sitting down, and if you're holding some expensive pipe to smoke it out of, make sure you're over carpet and not concrete or something, it hits you hard and you may not be prepared and drop the pipe.
- Though the effects only last 10 or so minutes, the come-on is very intense, and you may lose touch with reality, but it is only temporary and you will come back.
All in all, I really have no desire to do it again, the taste was awful, and the headache and burnt out feeling afterwards is enough to keep me away. Maybe if you're looking for a legal way to experience hallucinating, try it, but it's really not all it's cracked up to be.