When I first tried it, I almost gave up and went back to smoktech cartos
I'm glad I stuck with it.
The 2.4 Ohm head "works" on my twist, but it wouldn't work well at 3.7 IMO. The 1.8 ohm head (which comes with the big vivi nova but not the new mini AFAIK) works wonders
usable at 3.7, great at like 4.4. They cost like $3, are idiot-proof to change, and last a lot longer than the life I've been getting out of 1.7 ohm smoktechs
they taste better (after a day or two of breaking in), and when they get dirty, they don't fail catastrophically for me so far
they just taste more and more gunky/weird instead of going from working great to flooding with no warning. And they bounce back from cleaning very quickly. Changing flavors seems just a matter of rinsing the thing under hot water, and boiling the had for a couple minutes seems to work to reduce the break in time on a new one
it'd probably work great for cleaning it too.
I'm not sure if you'll get the same life out of a nova with just a single 1.8 ohm head as you would out of the ~2 boxes of cartos that you'd get for the same price, but the break-even point happens pretty quick unless you're having much better luck with your smoktechs than I have with mine.
Plus, after you break in the head, it's a much better vape than a 1.7 smoktech SC in a tank IMO.
Based mostly on reputation, if you were using good boges or fusions, I'd say it might not be worth your time
but compared to the smoktechs I've gotten (from 2 or 3 vendors), the vivi nova is hands-down better. YMMV, but it would surprise me at this point. After that first couple days of fiddling and wondering what people saw in them, it was not a small improvement
it was pretty big.
I have the last of my favorite juice (until the vendor makes more) in a carto tank right now, and I'm trying to figure out how to hold it so I can pour what's in the tank into a nova instead of just vaping it.