i've used it twice, once in combo with ecstasy. the 1st one was amazing, i didn't have one negative aspect to the whole trip, i was up the whole night, saw amazing visuals, changing shapes and colours, posters coming to life on walls, etc. my at the peak of my thought my thought pattern was completely turbocharged, i can't describe it. it's as if i had gained the ability to 'think in 3d', thinking about many different issues and concepts simultaneously. also, think of the mental relief and eltation you get when you find something/solve a puzzle/realise something, well i had that exact feeling prolonged over the peak of the trip, which was up to like 6 or 7 hours long maybe. other features i remember of the experience were things like being so tripping at one point that i was unable to form coherent sentences, and was coming out with random stuff about egg and chips. also, early in the trip, we were laughing a lot, and i mean completely laughing our heads off like maniacs, so much so that the next day i could feel i'd strained a muscle in my neck. The trip was done in a remote place far from home, and on the way back i remember deeply emphasizing with one girl's feelings who was standing opposite a bus stop we were at, who looked really distressed as cars tried to beep at her thinking she was a hooker. what i'm worried about is that i don't think i have ever been the same. i just don't FEEL the same. if i was to try to describe the change, i'd say i have become more absent-minded since then, but also i think deeper more often. it's as if my mind has been permanently lifted to a higher level of consciousness, and i grasp trivial issues less readily, like for example i have often been in the house, cooking or some shit, and been thinking so hard about certain issues that i leave the oven on or some shit.