I currently use a 3 piece e-cig. Not sure of model type or anything else. All I know is that I'm hearing alot about the 2 piece types. I'm currently considering switching to a two piece because I'm constantly having to take the cartridge off my atty and battery and plug it with the silicone cap to save juice. If I don't, my cartridges dry up quickly. Which system would one of you recommend?