Differences between the Vivi Nova and the Stardust:
The Vivi doesn't leak. The Stardust does, eventually if not right away.
The Stardust was re-designed so that the heads are more difficult to rebuild. They haven't done that with the Vivi (yet).
Many people complain that the Stardust starts tasting burnt. That's a rare complaint with the Vivi.
The Vivi costs 2x as much, but it also has 3 heads. If you use a variable voltage, it's like getting 3 for the price of one.
The Vivi is a lot easier to disassemble and clean than the Stardust, which was never really designed to be taken apart a lot.
The Vivi Nova never leaks. Never, ever, ever. You have to try hard to make it leak or flood.
At the risk of repeating myself, if you get the Twist be sure to get a kit or at least 2 batteries, especially if you get the 650mah version. Also, be aware how honkin long they are, especially the 1000mah version.
For the price of a pair of Twists, you can get a non-disposable variable voltage Vtube that will still be under warranty when the Twist batteries are worn out and ready for the garbage can.
So, you can buy 2 disposable Twists that'll get you 6 hours between them before you need a charge, or you can get this,, which will get you a year warranty and 12-14 straight hours between charges. Instead of a twisty dial, this has an LED screen that tells you your voltage. Instead of guessing if your battery is charging, it'll tell you the battery level. Instead of throwing it away when the battery is worn out, you pay $8 for a new battery.
$60 with free shipping. Use code Vtube30 at apolloecigs.com