I was lucky enough about a month ago to have an intermediate vaper get me off what most of you call "gas station brands" (Logic mainly). I went directly to buying a Provari Mini, and LOVED it.
However, it was taking a beating, and after realizing the "wraps" were not enough to keep it in as good condition as I'd like, I bought an 1100 mAh eGo-C Twist (altsmoke.com, by the way, in case any of you are finding questionable looking units out there for purchase). Sorta wish I'd started out with this, though I benefit immensely from the ohmmeter on my Provari.
Anyway, speaking of metering, though I'm sure there's a thread for this, I'd be interested in hearing how accurate your Twists are, voltage-wise. I don't have one of those fancy 510-threaded meters, but I used a standard probed multimeter on my Twist and it's between roughly 1.5 and 2 tenths off (for example: 4.8 read 4.94, 4.4 read 4.61, and 3.8 read 3.97).
Provari was dead-on, so I ruled out my probing technique as an issue.