I can officially confirm that ZX-1 is MDPV. It is not labeled as being HCl, though it could be assumed that it's being so is a given. It is a gray-tan powder with a flour like clumping tendency. The odor is very light, so it does not seem to be (heavily) contaminated as has been reported in samples from other producers.
I can also confirm that ZX-1 is the rotten hedonistic bastard-child of Satan and do not recommend anyone use it for any research unless they have an entire day after said research to sleep, and ideally something to keep them asleep through most of that day. I found 1mg to be well active, and approximately 15mg consumed over 16 hours in various forms produced a worse day-after than the most terrible e crash of my life, with elements of benzo and opiate withdrawal on the side, to make it that much more wonderful. Or, at least, thats what the 3mg "ZX" freebase hit and few lines of coke I woke up to reduced the hangover to. Christ!! Part of my brain is definitely begging for a re-dose 7 hours later, but with the hangover just beginning to lighten up, I'm going to make the wiser choice and get drunk off my ass instead. I had a great time with my research, but will flush it if I find myself craving it after today.
Edit: Just a follow up, even getting drunk didn't ward off the persistent insomnia or craving to do more. I'm now high once again, and will be disposing of this substance. Stay far away, even if you don't normally have trouble resisting drugs (like myself).