For reliable, I would go with one of these two which happen to be two of the best performing PV's also:
5 volt GLV2: lifetime warranty
Electronic Cigarettes and E-Liquid - Great Lakes Vapor
Variable volt Darwin: full 2 year warranty at no extra cost and full one year warranty on the battery.
Nhaler
5 volt GLV2: lifetime warranty
Electronic Cigarettes and E-Liquid - Great Lakes Vapor
Variable volt Darwin: full 2 year warranty at no extra cost and full one year warranty on the battery.
Nhaler
