I’ve tried it (the stuff in the OP). I smoked a big hit in a bong like pot. I had settled in a couch at a friend’s house expecting to be safe and comfortable during the trip, but the next thing I knew I was outside, across the street and several doors down, clinging to a tree. For several minutes you lose all–and I mean all–touch with reality. I was instantly transported to cartoon-land where houses, trees, and lawn were all coated with colorful patterns like candy wrappers (or those “magic eye” pictures that you stare at and the become 3D). I was moving through this landscape, moving through the walls of the houses, or their roofs since the world was tumbling about me as I moved through it. There was a vague, whimsical childlike or “kindergarten” quality to the experience, where everything was Tootsie Pops and Crayola crayons.
As the drug was wearing off I caught a brief glimpse of the real world, followed by a few more seconds of hallucinations and so on until the trip sputtered out. The chick who sold it to me was right there saying, “You’re gonna be alright, you’re gonna be alright”. It’s absolutely neccessary to have someone there to reassure you like that. I was like, “Am I gonna be okay? Am I gonna remember my phone number?” She had followed me out when I bolted and pushed me out of the way of a car coming down the street. I have no recollection of that, or tumbling head-over-heels down the steep front steps, or even how I managed to pass through two sets of doors completely blind. I had bought 2 hits, but as I lay there in the grass, totally stunned, I pulled out the little packet and gave it back to her saying, “Take this away from me. I don’t ever want to do that again”. Back inside I kept saying, “wow, WOW! Fucking unbelieveable!” I’s still a little bit freaked out about it. I don’t regret it; it was awsome, but once is enough. It’s terrifying.
Hope that helps.