Beep beep fresh anecdotes:
Took MDMA with a group of ~12 on Friday at a show we road tripped to. We got stuff from a reputable source local to the area, to my disgruntlement it was just 1 big rock and I spent the entire pre-game making parachutes w/ a $20 scale that was hardly working brand new. It smelled lightly of the usual M smell, in structure it looked quite similar to the Quartz MDMA up here, but a bit more amber toned. It crushed to an almost-brilliant white powder. Doses ended up with a probably 75-125mg margin of error, let people eye ball and take the dose sizes they wanted. Was the best we could do.
People got smaller doses than they wanted b/c more ppl decided to roll last minute. A lot of ppl who usually take 200mg took the bigger >100mg doses, and the rest of us got probably somewhat sub 100mg doses.
It was a wonderful, wonderful night of reuniting friends, but nonetheless:
Those that purposefully took the smaller ones (~80mg) did NOT get fully dilated pupils. This was very apparent, but they were definitely rolling. I reckon I took 90mg, and I was not preloaded with a psych, it didn't feel like the strongest roll of all time and it was seriously carried by music we love & good friends. Otherwise I think I would have felt more underwhelmed. But, friends said my pupils were fully dilated. Come-up was more strained at a proper venue, I spent a lot of time sleepy rolling & sitting, if a particularly bangerish song came on I'd be filled with energy to dance & get my heartrate up, but it was ephemeral. The music, and sound overall, did not seem to take on that visceral quiet-loud timbre it does when you're really rolling. To compact this, I think they could have turned the music up about 20%.
It was 50/50 on pupil dilation in the crew. The ONE person who got ~160mg (bday girl) had the saucers going on that withstood the really bright visual show & I think was obviously the highest person, but could be some confirmation bias here. Overall the MDMA felt "good quality", there wasn't anything characteristically wrong with the roll, I just felt like most of us needed to have definitely taken a bit more.
Wouldn't that be a neat & tidy bow to wrap this all up with?

The MehDMA is really just a lower MDMA:byproducts ratio so your 100mg ends up say, 80mg, and theres no simple or easy way to suss that out... This doesn't address the anecdotes about futile dose increases on the supposed MehDMA, amongst other things. But what I mean to say is, low dose MDMA seems to display a lot of the MehDMA symptoms, as so many have described it since the dawn of time "I just didn't quite roll".
Having taken MDMA on its own a couple times since I've tried paying more attention, might be obvious, but I feel I can definitively say LSD or any psych potentiates the crap out of this stuff, no questions asked. Most of my fellow crew candyflippers seem to agree on this. Kinda abstract, but when on psychedelics I feel there is a sort of lust for "tension breaking" events/moments or sounds, and w/ MDMA & really loud punchy tunes, you're just getting fed that repeatedly & its just electric.