I just received 5g of 3mmc......after searching noticed it was like 4mec but weaker than 4mmc......some positive some negative feedback. Not whole alot on this, maybe can get a legit answer on here.
I haven't heard any reports on 3-MMC, but I've seen some vendors supplying 5-MMC now too, no idea on the effects of either of them but it would be interesting to find out.