Sorry East, strongly disagree dude, but much love lol
Provari is nice, but it's not top of the line for VV unless you insist on it looking like a standard tube mod. the battery life sucks, plus it's a pain in the ... to use if you like frequent voltage changes.
Same with the GGTS. The GG feed systems are awesome, and IMO is the only thing that makes GG stand out. The ggts alone is just another tube mod, an over complicated, over hyped pretty thing with too many small parts. So again, if you find one with a GG feed system it's worth it. Otherwise all tube mods are basically the same. Good news though, if you're willing to pay twice retail for a used one, I'm sure there's a dozen people trying to sell one as we speak on the classifieds. For the price of a used ggts/ufs, you could buy a brand new Darwin and 2 reo's.