Don, Deetz, and 5cardstud, I really appreciate that you took the time to respond. Don, I've been using all your links and looking very closely at each mod. I even made a spreadsheet to compare. For many of the devices, I'd need to get different batteries (the protege, Precious M, provape-1 and ICON) and are 3.7 devices, correct? Well, probably 4.2 like my chuck, so while smaller and pretty, don't have the options that the Buzz