My first was a health-e cigarette, because that was all I could find in my neck of the woods (Poland-I'm an English teacher) on short notice before going to the UK for the holidays. I was desperate to get something quick to beat the bans, and wanted to try smoking on an airplane before the powers that be got wind of e-cigs. It isn't completely awful, or at least mine isn't. I've heard they can be complete trash, though. Some have been known to catch fire and whatnot. I still keep it around as a backup backup.
My second was a supermini. Miles ahead of the first, quicklt replaced the health. I still use it for dripping while I'm at home, and for the times when my platinum 901 (the current king of the hill) is down for maintainance. I still have yet to pull the trigger on a single atomizer on any of them, and have only had minor battery problems. In my experience, a little rubbing alcohol and canned air goes a long way in keeping these things running.