i've been taking a lot of "psilocybin" this summer...
i put it in quotes because i'm not 100% sure that it's actual psilocybin (for all i know it could be just another rc) because i've never heard of it being extracted before. but it comes in powder form in little capsules and i'd assume 20 mg or so per cap. i DO feel like i could take a shit ton of them though. the most i've taken was 5 caps and although that was pretty bitchin i still feel like i could handle more... :/ shit just gets expensive.
that being said, the trip is not really comparable to shrooms in any way for me. i don't know if that's because the actual ingestion of the mushrooms makes such a big difference or if it's because this stuff just really isn't legit psilocybin. but for me, visuals are way less intense than shrooms and there isn't NEARLY as much nausea. it's always a fun and happy time though, which i actually don't really like because i miss the EVILness of a good shroom trip... :b
edit: BUT, my dealer has been selling it to me as psilocybin extract. so i hope the fucker's telling the truth, but you never know! good luck!!