I'm definitely going to pick up a couple of these, but I think I'll wait a month or two to hear more reviews and see if the price drops by a couple dollars. As long as there's no major issues found with these, I think they will make a perfect portable VV setup with the higher ohm clearos or DCCs.
As for putting off the Provari because of these, not likely. Regardless of how cheap these get, they won't be cheaper than a $10 18650 battery, so the Provari will be more cost effective in the long run. Also, the Provari has other features that are useful, not just cool, although the cool factor is there as well.