I have never tried it, but some people say it is in between amphetamine and mdma, but more clear headed. Music sounds nicer and you may want to move around a bit. You may experience a low the days after.
For more information I recommend you read a lot of reports here: https://erowid.org/experiences/subs/exp_4Fluoroamphetamine.shtml
If you try it have fun :)
RE: 4fmp (drug)