Long term review -
I ordered my VVPV on 1/19 of this year (that was the official release date). There were some release issues and it took until 2/19 to get it. Some of the chrome units had an additional problem... mine was chrome and had that problem

. Instead of having my chrome one repaired, I decided to ask them to replace it with a black and brass unit. I received that on 3/19. It is perfect.
For the last 4 months, I have put no less than 4 ml a day through it. It was more (almost 6 ml a day) before I bought my REO VVW two months ago. I use my VVPV all day at work and my VVW all evening at home (and a few other mods as well). So, all told so far, I've consumed a little over a half liter of juice with my VVPV. It has been flawless. It has never failed to fire. Juice feed control is excellent. The variable voltage has been perfect. I have had no trouble with my pump (I did buy a spare just in case, and I had a leak with the first unit, but solved it with super glue). Battery life is incredible. I get almost 6 ml of consumption between charges. It has performed absolutely perfectly.
My VVPV is my primary PV. It was worth the wait and the experience I described above about the time it took to get a working unit should be more descriptive - notcigs customer service was top notch and there were some things that contributed to the length of time involved (for instance, Buzzkill had a serious personal tragedy during that time period). So, though I think it is worth mentioning that it can take a while to receive a VVPV, I also think it's important to know that notcigs customer service is very good.
I have owned or used a whole lot of PVs including a fair portion of the "high end" mods out there. I've been fortunate to have had good timing and good friends who are just as interested in vaping as I am and that has led to me being able to check out a lot of different gear. --> I wouldn't trade my VVPV for anything currently available. - In the interest of full disclosure, I consider my feeders to be superior to any tube mod I own or have ever used. The feature "feeder" is very important to me. I don't see myself buying anything that isn't a feeder any time soon.