well, then we get into "how long is long-term?".
With technology in it's infancy as far as vaping goes, not sure I WANT something to last *forever*. At least, I don't wanna pay the big bucks that that seems to incur.
And BTW, TC1, I don't think there are many who would argue that Twists and Egos are great backup devices. If you took a vote out there, for 10,000 people who vape, and took a count on devices used, I have NO DOUBT that they would show the highest numbers.
Altsmoke is a terrific vendor. They sell SBs, but they sell nice Joyetech Twists, too.