Looks like I haven't posted about a-PVP here before so I'll give my 2 cents.
I've tried both MDPV and a-PVP, I've also tried all of the following stimulants: Cocaine, Methylphenidate, Ethylphenidate, Pentedrone, 4-MMC (Mephedrone), 3-MMC, 4-BMC (Brephedrone), Methylone, MDMA, 6-APB, 5-APB, IAP, Amphetamine, Methiopropamine - along with a few others like Caffeine, Pseudoephedrine and some other RCs.
Overall out of those I enjoy MDMA and 6-APB the most, but for obvious reasons they're a once in a long while thing, and as such I try to go with straight stimulants that aren't causing serotonin down-regulation in the meantime.
Cocaine is a good high but it's a waste of money when compared to other stimulants available. Methiopropamine and Pentedrone are decent too but a little on the weaker side for what I usually want. Amphetamine and Methylphenidate are quite dirty highs with rough comedowns, so again not what I want. Ethylphenidate is nicer but also still quite dirty.
That leaves MDPV and a-PVP. When snorted both of them have a great kick to them, very similar and between the differing quality from one batch to another it'd be pretty easy to mix them up when taking them via this ROA at first imo, with a-PVP sometimes being stronger, MDPV being stronger at other times. It seems that MDPV has a slightly bigger kick to it when snorted but also has a MUCH bigger comedown.
Snorted a-PVP for me has basically no comedown for me unless I binge for days in a row or haven't slept, in which case I'll be quite tired and lethargic at the end, but nothing like the scatter-brained terrified and paranoid zombie state that the MDPV comedown usually is. I only feel comfortable taking MDPV if I have a suitable amount of alcohol or benzos to lessen the comedown, whereas I can take a-PVP without any other drugs, and even then the comedown is easily bearable.
I also find a-PVP to be much less compulsive than MDPV. With MDPV it works like this, whatever amount I take out with me when I'm going out for the night is going to be consumed, no matter how little or how much (well, up to a certain point, but that's a pretty large point) - with a-PVP on the other hand I can set myself a time to stop and I'll stop then, I might feel like another bump/vaped hit would be great, but I can avoid doing it. I also don't feel so sad if I do run out/hit my limit. The comedown is also MUCH worse than from snorting it.
Then comes vaporisation. I've vaped MDPV plenty of times, and it's stronger than snorting it, but very short lasting. Within a few minutes I'm left with just some residual stimulation and VERY strongly craving another hit, even though I know if I just snorted a slightly larger dose I'd feel just as good and it'd last me 1-2 hours instead of a few minutes. Was an overall waste but I could never stop myself from smoking more and more.
When vaping a-PVP it's a whole new animal, the rush is so strong I'm usually completely floored with so much energy I can't stand, and it feels like my entire body is experiencing waves of orgasmic pleasure. My ears start ringing and I just lay back and usually end up saying something along the lines of "Woaaah" before I start grinning like an idiot and sit there enjoying it. The rush itself lasts a few minutes, maybe 5-6 even, but I'm left with a really awesome high that's way better than snorting it for the next half an hour at least. I don't find the comedown to be much worse than snorting it, so still virtually non-existent unless I've been using it for a very long time. I also find the compulsion to redose is a lot smaller since I'm very happy with the high until it wears off, and even then, since I usually smoke and snort in the same night, I don't feel the need to smoke more after the 30 minutes.
I've also checked my BP and heart rate on a-PVP and they were lower than on MDPV.
Overall to me comparing a-PVP to MDPV is like comparing Ethylphenidate to Methylphenidate, it's what MDPV *should* have been but wasn't.

Though unlike Ethylphenidate to Methylphenidate, where MPH is a little more potent, the potency of a-PVP is about the same as that of MDPV, and seems even greater when smoked/vaped. :D
TL;DR: So in conclusion a-PVP is my favourite straight stimulant I've tried to date. Works great whether I want to be functional or want a recreational night of fun. Less side-effects than almost all of the stimulants I've tried, and higher doses mixed with alcohol give me an almost MDMA-lite type experience.