To answer your question...it depends. What do you consider a "good vape?" Do you want massive TH, lung hit, awesome taste, plumes of vapor? What are you looking for? I'm sure the Provari and Darwin bunch will be along shortly to discuss the attributes of their gear...and that's fine if you want to spend a bunch of money to do it. But you can build (or buy) a VV box mod, throw a carto on it and get the same thing.
What is your experience level at
vaping? If you're new, I'd suggest you grab a good 510 connection like an eGo, E Power, Riva, etc and play with various cartos, clearos, etc until you find out what works for you.
I've tried the VV thing and...honestly...I found it to be a neat gadget, but nothing like what it's hyped up to be.
I like a huge TH, lung hit, and vapor production more than anything. I use a lowly eGo batt with an eGo Mega Dual Coil Carto on it from Vaping Zone. It'll hit like nothing else.
For absolute best taste, lung hit and vapor production, my nod goes to a Fluxomizer with a seal mod done to it. The seal mod takes about two minutes to do , only has to be done once, and you will vape literally almost embarassing clouds of vapor with it.
There is no "one PV or attachment fits all" in this game. You just have to find what works best for you.