Not 4-MAR but I had a bit oof the 4,4'-dimethylaminorex variant which was briefly avaliable from RC shops. Oh boy was it great, it's still under my all time top 3 of drugs and that list isn't exactly short.
Can't say how much these two compare, 4,4'-DMAR inhibits MAO - A, thus leading to huge increase in serotonin but it can't be too strong at this site or it would cause serotonin syndrome. My guess is that 4-MA must be like a less serotininey variant of what I had, which would still be great.
4,4'-DMAR in low dosage was like a realkg emtactogenic and euphoric meth variant probably, duration 12-14h with a brief crash and after I was able to sleep. It got pulled from market because of some unfortunate, and unnecessary, deaths. They sent out overdosed sample pills with no warning about either 2h onset latency (made people redose or mixuse) or MAOI property.
Currently they were three other variants available, but don't know whether these are good or not, in past there was another one (forgot which) and while I didn't try it, I read only neutral to negative reviews, a primarily norepinephrinergic substance. Uh, seems the vendor already discontinued them which might be either them not being worthwhile or that they couldn't source more - one shop listing kilograms of them was busted so it might well have been the source.
So we needa wait again
I don't get it why this drug is soo rare when really only negative seems to be the duration.