Ok, I have some of this stuff. Marquis reagent is a pale reddish-purple, and Mecke is a very dark purplish-black, which is pretty much identical to what I would get with 6-APB. This particular batch I have lacks the industrial-strength cleaner smell I've gotten with some past batches of 6-APB, so hey, that's a plus.
I took an oral dose of 75mg about 5 hours ago, along with 400mg of chelated magnesium in case of jaw gurning. Waited a half hour, then ate a small lunch, knowing I probably won't be hungry for the rest of the day. About a half hour after that, I started to feel it coming on, with waves of hot flashes alternating with nausea. This was pretty unpleasant...I can deal with nausea on its own, but combined with hot flashes I start to freak out, because it reminds me of the one and only time I took mCPP I got really bad hot flashes on the come up and that developed into a full-blown panic attack where I was convinced I had truly poisoned myself. Anyways, this time I took half a unisom to cope, and that made me a little tired but at least it diminished the nausea a bit and staved off the edges of panic I could feel creeping in.
It was another couple of hours before the hot flashes subsided and I relaxed into a fairly decent contented stimulation with mild OEVs and occasional nystagmus. Not getting a whole lot of euphoria though, and I'm not really sure it was worth the rough comeup. At this level I'd say it was about equivalent to 100mg of 6-APB - I would normally do 125-135mg of 6-APB, and I've gone up as high as 145mg. I haven't taken any in almost a year though, or any other in the MDxx family, so I shouldn't have any tolerance built up. I think if I try this again I will split the dose in two and take them an hour apart. I also think I'm getting too old for this stuff anymore (I'm turning 35 in a few months) and maybe it's time to give all of those serotonin receptors in the gut a rest, they've certainly taken a beating over the years. Maybe rectal admin would help with that if I do this again, I don't know. Anyways, that's my report!
Edited to add: It's the next day, and I feel pretty horrible. I barely slept, and had a few bouts of diarrhea during the night and early this morning. I feel dehydrated and overheated and I'm getting brain zaps too. I forgot to mention before that I had taken some 3-MeO-PCP the night before doing the 6-APDB, and I'm starting to wonder if there's a bad interaction between the two and that's what's been making me feel sick. I did some googling today and apparently it's a bad idea to mix methoxetamine with MDxx or 6-APB, so it's possible that 3-MeO-PCP also shouldn't be mixed with serotonin releasers (even if you take them 18 hours apart like I did). It's also possible that 6-APDB is a lot more potent than 6-APB and I just took too large of a dose. Anyways, it's going to be a long time (if ever) before I put this stuff in body again so maybe some other brave psychonaut can figure these things out.