I'm sure I ended up with a load of this stuff just when MDPV became illegal, although it's impossible to be sure.
I never broke through that initial sketchy patch I always got at the start of a PV run or sometimes after vaping a little too much at once, I kept dosing thinking it would come good but it just got worse and I managed to flush the stuff.
It could well have been something else but it was the potency of MDPV and similar in duration etc. but it put me right off, I pretty sure I haven't taken any PV since.
I also recall reading about someone in the US getting busted for importing the stuff recently, it's apparently popular over there. I'd always seen PV as somewhat of a niche drug TBH.