Man, this is crazy. I haven't been vaping long. I promised myself I'd not become a mod freak. I am becoming the mod freak.
It's hard not to with all of the different devices out there. The best thing to do is to figure out exactly what features are appealing to you before you start spending. There are a lot of different things to consider. Just as an example, I replied to a review thread recently about the BP. It was a fairly negative review, which in and of itself is fine. But, what struck me as a little odd and made me feel compelled to reply was that the reviewer's disappointments and complaints were primarily about some of the features of the BP that are really desirable to some people. He didn't understand the differences in features and chose a PV that didn't have what he wanted it to have -- all because he focused on the single feature variable voltage.
Don't get hung up on a single feature when you are buying mods. Drip wells, catch cups, connector types, colored displays, no display, feeder, tube, metal, wood, plastic, button types, on-off switches, etc etc etc etc. All of these things need to be thought about at least a little. -- And some "personal experience" type advice: The very first two things I look at now when I consider a new PV are the switch/button and the quality of the connector. The two most likely failure points of any PV are the button and the connector. The better those are, the more likely it is that the mod will last.
We can debate all day about which variable-whatever (voltage, wattage) PV is "the best," but that strikes me mostly as macho posturing about whose you-know-what is bigger. Not that I don't like good reviews that point out the pros and cons of various PVs. I like that a lot. But for me, life is too short to argue about vaping, especially when vaping is so great to begin with.
I must have missed the argument. --- However, I really was hoping to come to some conclusion myself if I preferred the VV Woodville or the VVPV. I have made up my mind that I won't be buying any more tube mods or plastic boxes (and I do have a madvapes VV box and it works just fine - no complaints). I don't think I'm very likely to buy any more tanks. I'm likely to stop buying most of the cartos I keep in my stock for different devices and will probably just stock 2 different ones from now on rather than the dozen or so different cartos like I have been. I have even been trading away and selling some of my PVs. My VV feeders have literally, actually, and permanently changed the way I vape.
I've come to a mental impasse regarding which of my VV feeders I prefer. I've had the VVPV quite a while longer than the VV Woodville and it has become a very familiar item in my hand. But I've had a REO mini since late last year, so moving to a larger form factor wasn't strange at all - though I will admit that the different build material throws me a little bit. The wood might be too elegant for me. I'm sure I'll feel differently once it has some scratches and dings. But regardless, both of these devices perform well above my expectations (and those expectations were very high).
I wasn't very enthusiastic about the feature 'variable voltage', and really, I'm still not. I have a couple of VV boxes. They work just like they are supposed to. I found myself setting the voltage to what I could produce before (lacking regulation, but still pretty much what my batteries could do in non-vv PVs). I've already done the work of matching attys and cartos to voltages, so I don't stray too far from what I was able to do with single batts and stacked batts and ni-mh batts. Plus, I've had a couple of 5.0v resisted mods for a long time.
For me, where VV begins to shine as a feature is when it is coupled with a reliable feed system. That's when a PV starts to exhibit consistency. Consistency is what I want. Variable Voltage regulators or regulation provided from a resistor are nice, but until the atty or carto always has exactly the right amount of juice all the time, VV or single voltage regulation can't provide a consistent experience by themselves. Tanks are Ok, but do have their issues. Cartos are OK by themselves but change as they age and wick differently when full vs half-full vs starting to get dry. Dripping is great and an excellent way to exploit voltage regulation to gain consistency, but is a hassle and is often not convenient or appropriate (while driving, for instance). The feature "feeder" coupled with the feature "variable regulated voltage" is currently the best method I can find to achieve "consistency".
It'll give as good a vape as the big expensive PV's and do it for a lot less. 
