Got a 1g sample from a good source in germany. I have not tried 4-MMC or 3-MMC, and I am quite skeptical of cathinones in general. Anyway, this 2-MMC seems to work.
I tested a 100mg pill first, followed by another 100mg an hour later. There is definitely some energy, although no euphoria. Focus is good, but not overwhelming, so this is not a good RC for accomplishing tedious tasks.
No crash so far (T+7hrs). In all is quite a pleasing mild rush, some energy and focus, no brain scatter associated with it. Good for playing games or exercising IMO. I would experiment with initial does of 200mg and go from there.