Hey, I have had an auto 510, auto mega 808, generic 4081 and SmokeStik 4081 batts. The 510 autos, not my favorite. They are sound activated and will turn on in traffic, clubs etc... The 808s are nice. They are a true 3.7v as opposed to the 510s 3.1v. So nice fog maker, and a nice warm hit; as well as most of them being vacuum switched. The generic 4081, not my fav, but then I killed it less than an hour(user error). The SmokeStiks are my favorite. 3.4v loaded voltage, excelent cartos and the switch is a very sensitive vacuum opperated switch. The most real-cig like experience that I have had from a PV. They are abit pricey, but well worth it when you consider the lifetime warranty and great looks.
SmokeStik ::: Alternative Smoking I even tend to use the SS PVs instead of my beloved eGo, because the auto switch works so well, and the cartos function flawlessly.