FWIW, I don't think GV passed up the Z for now because of the inaccuracy alone. I believe I read from the GV owners that they were passing on this version because of the high failure rate. Returns are very expensive for a vendor, and I think they got hurt a bit with high failure rate on the Vmax, even though they waited for a later version before carrying them.
Remember, 80 or 85% of us can be happy with our product and that sounds good. But 15% or 20% failure is way too many for a vendor to deal with. They expect about a 2% to 6% failure rate, not 10, 20, or 30%.
And retail prices may seem high to you when you see wholesale prices listed on distributor sites like Alibaba, but the margins are not really that great for a retailer when the cost of doing business is considered. Ain't no one getting to be 1%er Romney Wealthy on ecig business.