Signed up after watching this whole thing unfold over the weekend. Probably people will mistrust me for appearing out of the blue with this, but I find this whole experience very sinister.
I ordered some of this stuff from a non 'official' vendor. It came in gelcaps, I cracked one open and it has a crystalline white powder in there. Seemed clean to me, so I swallowed one of the caps down. My experience has included elements of most all of the trip reports I've seen here, although closer to some than others.
FWIW I've experienced ecstasy close to 100 times in my youth, although it became clear to me when I stopped doing this drug that those pills really could have had anything in. I have no doubt they contained, in part, MDMA, analogues/RC variants of this, ketamine and speed, not to mention god knows what other shit. I'm a regular cannabis smoker (although haven't smoked in the last month), and have experience with LSD (approx. 5 trips from baseline to +3) and psilocybin mushrooms (3 trips in total), and several other underwhelming drugs that are probably not relevant.
Onto the '6-APB'... taken on a friday after a 9-5 at work, probably around 7.00pm. It took a long time to come up - between 90 minutes and 3 hours.
The high itself was pretty strong, not unenjoyable. I signed into facebook, which is a site I haven't used in over year, and started talking to people who were online at the time. I was feeling a really pleasant ecstasy-like high, but far more controllable. I felt the same confidence, and a hugely increased social ability, but it was much less 'drugged' than MDMA. I didn't feel obliged to tell anyone I loved them, and as high as I was, I don't think anyone would have suspected me of being on a drug at that point.
Throughout this there were some disconcerting side-effects, but nothing I've not experienced before: extremely dry mouth, slight muscle spasms. I noticed I couldn't seem able to keep my head still at all, it was bobbing up and down all night, along with standard destruction of the mouth a la pills. I never get a huge impulse to dance, even the only time I did pure MDMA, so I assumed this was my reaction to what other people had described as the uncontrollable urge to dance.
It made me need to urinate quite often, and when I moved around en route to the bathroom I was clearly very intoxicated - like being drunk in a way, almost dizzy/hazy. I was experiencing pretty strong visuals, mainly intense colours, discolouration of vision at times (white tiles appearing to have a coloured haze etc.) and mild morphing effects of images on digital screens.
This was all fun enough, whilst it lasted, and I was pleased that I had lucked into the 'real deal'. I guess the main high lasted at least 6 hours. Then the comedown started, and I was pleased as hell - much easier than other stimulant/euphoric drugs I've taken, with no real feelings of depression or self-loathing. But I was aware that I was not in a condition to sleep. Unlike LSD, this post-high, tired-but-can't-sleep feeling didn't really frustrate me. I had the weekend ahead of me, and just wasn't in that awful place where you're lying in bed, trying and trying and trying to sleep until you feel it's never going to happen.
Ha!
When I hit the 24 hours awake mark (about 13-14 hours after dosing) I realised: hey, I've not eaten anything. In that 24 hour period I had a small meal for lunch, and then avoided food in the afternoon as I was planning to try the drug. I wasn't hungry at all when I realised this, but it didn't seem too concerning.
I'll cut a long story short: between 9am on friday and 2am on monday, I estimate that I got less than 10 hours sleep - perhaps an hour or two on saturday afternoon (this actually felt like a sort of 'waking sleep', and I'm not convinced it 'counts') and then between 5 and at the most 6 hours on sunday night. Bad hypotension throughout the weekend! And my appetite had left the building, quite frankly.
So on Monday, I got out of bed feeling incredibly weak. Moving around the house made me feel like I would pass out, I was very light-headed. I still didn't feel hungry, but after a shower I was sweating for no obvious reason, and experiencing some kind of muscle tremor in the area of my stomach. Now, I'm no expert, but I think it's obvious that my sleep deprivation and lack of nutrition over the previous three days contributed to this.
I forced some food into myself and I have been feeling better. But I'm still not back to normal yet - some aching in the muscles in my arms, mouth still quite dry (but not worryingly so) and still underwhelming sleep impulse. I should also note that my penis did the shrinking thing during the peak experience and most of saturday's comedown, and on sunday was totally weird - thinner than usual, and less soft to the touch than usual when flaccid. I didn't come close to getting an erection until the monday morning (around midday), and really I forced this one just to make sure it was still working

Sex drive is non-existant at the moment though.
This is about all I can remember. I'm very interested to know what the fuck this stuff was, because I would not recommend that anyone takes it. The high I got was good, yes, and if it had ended with even a 12 hour comedown I wouldn't really complain. It wasn't so good that I'd want to do it again any time soon, or with regularity, but I've had far worse highs than that. But the comedown is just... ridiculous. Okay, no depression, but the body response is worse than anything I've ever come across.
But this stuff is a clean-looking white powder. It suggests to me one compound, although I have no idea what it could be. I'd believe the theory that this is 6-APB mixed with some disgusting stimulant, but I have no frame of reference to speculate really. I can upload images of the gelcaps and the powder within, if anyone wants to see it. And if anyone can analyse it, you're welcome to it!
After this, I think there's a genuine chance that some irresponsible people are going to die on this stuff. I took one cap, but it took so long to come on that less patient people than I could have taken even more. Whatever the stimulant element is in this, it is the nastiest drug I've ever come across. It is entirely malevolent.
So I just wanted to contribute this and suggest to everyone who hasn't tried it: wait! I'm never touching it again
Possibilities (pure speculation based on web response to this stuff so far)
1. I had real 6-APB. 6-APB has profoundly different affects on people.
2. I had real 6-APB cut with something(s) else not found in other samples from different vendors, or has massive active impurities.
3. I had some mystery drug or drugs, which was the result of an immoral vendor who did not have real 6-APB.
2 or 3 seems most likely. I know we can't discuss vendors here, but my advice to anyone who still hasn't been put off this stuff is to do the most thorough googling of your life before deciding where to buy.
Edit: I also think it's clear that my comedown symptoms match the description of serotonin syndrome. This seems to be a recurring effect amongst people who've had similar experiences to myself, which implies that if you end up with the chronic insomnia variety of '6-APB' you may develop it as well. Serotonin syndrome and hypotension are basically an accident waiting to happen, reaffirming my unfortunate belief that this won't be a victimless substance by the end of the year. I hope I'm wrong, of course
