Just wanted to chime in and say I've been using mine for two weeks and loving it to death.
Switch power 'on' lasts at least 8 seconds or longer.
I like to take long slow draws and have never had it kick out on me unless I did 3 or 4 really long slow draws in a row, I think it kicked out once doing that.
Switch has worked flawlessly, not a single problem.
Switch has a -really- comfortable high quality feel to it.
I've been using the Smoke Tech 1.5 ohm dual coil cartos 90% of the time and it works flawlessly with them.
Also use LR attys for dripping, no issues with them either.
Battery life:
With the standard atty, battery life is about 1.5 days.
With the SmokeTech DCC, about 3/4 of a day, and one day I was vaping like a madman (consider it a heavy usage situation) and it died after 1/2 day, the DCC in heavy use does definitely shorten the battery lifespan.
BUT the performance of the 3.7v coupled with the DCC is a fantastic combination.
Great flavor, throat, and vapor.
Like this:
Using E-Power, Dual Coil Carto, 100%VG, will produce vapor clouds like a 5V Mod, more than the average person could possibly want or need.
AAMOF, the thing kicks ... and
I haven't had a single problem with it at all and I've been vaping the thing day in and out for two weeks now.
I even tried a few of those crappy G4 cartos on it, the first one leaked all over it (god those things are junk), I came back to it after setting it upright an hour later and juice from the ultra-crappy G4 had dribbled all down the sides.
Cleaned up real quick and caused no problems.
And I had never thought about the day they would make a replaceable VV switch for it, Hell to the Yeah on that one!