I've been a lurker on this forum for a while now but felt compelled to contribute to this thread as mdpv is a chemical I find exceptionally interesting and have a fair amount of experience with. As far as my substance use/abuse background goes I started out several years ago smoking weed and taking mdma/lsd occasionally at shows and continue to use those 3 (weed everyday, mdma and lsd more sparingly). As I got older I became a moderately frequent cocaine user and have tried just about any common street drug that can be smoked or snorted - I never have nor ever will inject anything partially in the name of harm reduction but mostly because needles terrify me.
I was first introduced to mdpv while trying synthetic drugs because of probation drug tests. This was 4 years ago - a bit before the bath salt/herbal incense boom. I started buying the mystery stimulant blends that I still refer to as bath salts though I've bought them under an absurd amount of guises - slug repellent, jewelry cleaner, spot remover, hookah cleaner, carpet deodorizer, and a few others I can't recall. After my local smoke shop got busted, I was able to figure out with a bit of research that my product of choice, according to the vendor, was a 65% mdpv / 35% lidocaine mix and after purchasing the pure chemical I am certain that mdpv was in fact the active chemical.
MDPV made it impossible for me to ever be satisfied with cocaine. It just never got me to the desired effects before the negative effects of having done too much started to take hold. I suppose you could say MDPV is my stimulant of choice so much so that cocaine, meth, and amphetamine just don't cut it anymore. The thing is, it's not necessarily because it's so awesome - it carries desire, at least for me, far beyond what it should if that makes any sense.
Since I live in the US, I discovered the legendary mephedrone right as it's availability started to decline. Mephedrone is the only other chemical besides MDPV that I literally fantasize about regularly. I haven't used 4mmc in a while because of the price/availability and I limit my mdpv purchases as much as I can but still go on small binges every month or so. However with 4mmc the effects are EXACTLY what I want in a drug and, unlike most people, I experience minimal comedown effects (it's the same way for me with MDMA which I know is atypical). MDPV's hold on me is a bit more of a mystery because it carries a pretty horrific comedown and the effects aren't nearly as desirable to me as mephedrone. So both substances for me, are wickedly addicting, but I understand why I want mephedrone (wonderful effects, minimal comedown) whereas I can't make as much sense of my mdpv cravings.
I'd advise anyone against trying MDPV for the first time as that was all it took for me to get hooked hard even as someone who was able to use cocaine and other addictive substances fairly responsibly. If you did end up trying it, which I know you've made the wise decision not to, I've found that forcing myself to eat (even if it's a couple protein shakes - anything to ingest some calories) and making sure to have benzos/weed ready for the comedown helps immensely. The appetite suppression and insomnia are brutal and I believe that's what causes most of the hallucinations - it's literally no fucking problem to go without sleep for 4 days and drink minimal water/eat almost nothing if you aren't paying attention and have too much of it lying around. As others have said, chances are you won't be able to stop before you run out.
It's one hell of a drug
