IMO chain vaping w a Nova only works if your juice level is sufficient. Anywhere down halfway mark and one will experience burnt taste if chain vape. Of course... It helps if you are on a runny juice.
Simply not true...
I finished off a tank of HHV Neavenly Tobacco that I ordered with a 30/70 mix (it was pretty thick) and I was able to vape it down to about the next to the last marck on the tank (0.3ml) before it became an issue, at at that point, it wasn't that it was tasting burned, it was just more fiddling with the "tip and swish" than it was worth.
The key to the Vivi Nova is that once it gets below the halfway mark, you need to tip and swish or roll your PV, so that both wicks get washed with juice at the top. If you do this every other puff or so, it won't taste burned, and you can vape it nearly empty.
Is this a silly tweak that most folks don't want to be bothered with? Yes. Is it a weird quirk of this particular tank that will annoy the heck out o some people? Sure. Is it one of those things that some "vape geeks" will find an endearing trait and others will consider it a fatal design flaw? Probably.
But much like high-end audio gear, the simple fact is that not every bit of kit is perfect of revery consumer. A turntable that takes hours to set up, an will only work with 10% of the cartridges on the market, and needs a special platform, an only sounds great with 3 or 4 preamps might be the bees knees for me, because I dig that sort of tweaky, geeky, eccentric sort of gear.
But to a casual stereo consumer, or someone who prefers CDs, it will be like a visit to the 7th level of hell...
Same goes for vape gear. Just because YOU have a bad experience with a bit of gear, or you are a casual vaper (and not a geeky hobbyist, or balls-to-the-wall vapophile) doesn't mean that gear is a POS. IT just means that it's not suited to your habits, expectations, desires and abilities.
I LOVE my Vivi Nova. I carry it around everywhere, and it has never leaked a drop. I've laid it down on my couch and my car seat. I've carried it it my coat pocket. I've worn it on a lanyard. And ne'er a drop has spilled.
And I've vaped the heck out of it--with thick VG-heavy juices--and it never tastes burned.
I understand the eccentricities of the Vivi Nova. I vape within those limitations. I adjust my vaping habit, form and routine to maximize my vaping experience with the Vivi. And it works for me. In fact, I will be buying a LOT more Vivi's in the future--the new "window Nova", more of the original Novas, some of the Mini Novas, and probably whatever they come up with in the future.
I'm not saying the Vivi Nova is the be-all and end-all of tanks--it certainly is NOT. In fact, it leaves a LOT to be desired--no glass tanks, top-feeding coils that can be twitchy and finicky with thick juices, etc. But it is easy as heck to clean, REALLY easy to fill or top off, and a breeze to change the coil on. And for the price, it's pretty darn rugged too. And if you are REALLY geeky, the heads are pretty easy to rebuild to your own custom specs...
I'll get some carto tanks in the future, I'm sure. I'll also buy some more expensive and sophisticated RBA tanks. I have a LONG "wish list" of tanks and drip atomizers that I am lusting after.
But when it gets down to brass tacks, and I need an easy-to-fill, easy-to-maintain, easy-to-clean, and easy-to-vape tank, I'll reach for my Vivi Nova...