In lieu of a lengthy review of the eGo-V LCD Variable Voltage Passthrough I bought from ecig-parts.com, I'll just say that I really like it a lot. I like the wide range of voltages available (3v-6v in .1v increments). I like being able to see the voltage I'm set at and remaining charge with a glance at the LCD. I like being able to plug in the USB cable to charge it without having to remove the cone and DD (i.e. atty/carto/tank). I don't like the flush-mount fire button. I can't just feel for