Review:
I purchased this after Chris mentioned that it works with 808 as well as 901 atomizers, and at the time all I had were 901 parts. This is probably the best $13 I've spent on an e-cig accessory. With 5 volts running through it, the flavor and throat hit of almost every liquid I've tried has been really excellent. It will tend to go from "tastes great" to "tastes like a burned tire" much faster than on a battery. That's a byproduct of the higher voltage which simply burns through liquid slightly faster than a 3.7 volt battery. Not a problem with a passthru, since you're probably at your computer anyway, and if you don't keep liquid around well that's your own fault!