I recently tried some 3-fpm for the first time, here are my thoughts on it. First some backstory, I haven't been "into drugs" for that long but stim wise I've done: 60mg Vyvanse too many times to count, IR 20mg Adderall orally and intranasally a few times, and street speed once. I would compare 3-fpm very closely to Vyvanse except that 3-fpm doesn't last nearly as long. It has a pretty smooth come up/down at least orally, and I don't feel jittery or really any negative stim symptoms. I dose my 3-fpm buy measuring out 200mg on a milligram scale, then just dumping it into a normal 500ml plastic water bottle. Then I can just drink a quarter down for a nice 50mg oral dose. It doesn't taste funny and it's very convenient, you can drink it anywhere and it just looks like you are drinking water, only downside is it takes like 45 mins to hit me. Good stuff, highly recommend.