I have gone through ~5g's of this in the past 3 months.
Started on a whim, requested a sample from a new vendor offering it. I've been prescribed adderall before, didn't like it so much. Used it years later off the street, liked it a little more, but always needed alcohol and xanax for the comedown. 2-fma immediatly felt so much cleaner than any prescription stim I've had before. I figured since it might come in handy for getting homework done this semester. I work a ton, and usually don't have any motivation left to be bothered with homework.
Worked okay at first, just using every few days to get a particularly boring block of homework out of the way. Then I "accidentally" stayed up too late, and got only a few hours of sleep one night. Used it before work, and everything was so much easier to do. This progressed into daily use for the past two months or so.
Tolerance went from ~15mg would get me lit. Even though this is a clean stim, I'm sensitive as fuck, and it would sometimes make me jittery and 'noid as fuck even at this dose. Now tolerance sits at ~30-35mg for the same, yet still weaker, reaction. Started to abuse the fuck outta this, would take some late at night when I should go to sleep to "do homework" and end up fucking off on the computer (and masturbating like it was going out of style) for a while. The stimulation was there, I just got used to it after a while. Then it lost the driving "YOU HAVE TO FUCKING WORK" edge, and just became "normal".
Speaking of sex, overindulgence of this chemical has led to me almost having sex with some pretty questionable/ugly women off the internet. Thank god for my "jerk off once before leaving" rule.
Towards the end of the semster, there were a few nights of no/1-2 hours of sleep. 2-fma came in very handy at this point, although dosages started getting out of control. I think I blew threw the last gram in about a week, or less.
At first, I felt pretty shitty anxiety sometimes. Not even as bad as adderall, but still there. Etizolam helped greatly. Also, have had a few different batches. One was okay, one was really good (about the best you could expect normally), the last was out of this world. Opened the vial and was hit with an immediate chemical smell that was present in the other batches, but almost overpoweringly strong with this one. Noticed I would need about 5-7mg less than normal with this batch, and that the comedown/jitters weren't as bad (not that they are that bad normally).
Overall, this is the classic stim addiction story. I'm bumping my dosages down every few days. Don't really feel like quitting outright and seeing how that goes. Don't really feel like quitting at all really. Would much rather stay with this than fuck with any stims I could get scripted. Will at least get my tolerance back down before summer classes start again.
Also, all dosages are either oral or rectal. Oral seems to last a little longer to me, and is more spread out. RA has more euphoria, and comes on quicker, but seems to last a little bit less time.