Got my Vivi Nova Mini and Vision CC (replaceable Stardust) today. The Stardust already had a small crack on the plastic, but it is still usable. I like both better than the Kanger T2. I seem to have a bit of a battery problem as none of my batteries (eGo Twist 650mA, eGo-T 650mA, Chinese 3.2/3.7/4.2V eGo) give me the performance I'm expecting, even from the rebuildable Phoenix dripping atomizer. Or perhaps my tolerance has grown because of increased vaping.
Anyway, Stardust feels and even tastes like a regular Stardust, and the drag is the tightest of the group. T2 is too airy (and hot, somehow moist) to my liking, and the Vivi Nova Mini is somewhere in between, pretty much optimal to me. I can see the Vivi Nova Mini becoming my favourite clearo/ato.
The replaceable heads (on both Vivi Nova and the Stardust replaceable, I suspect they are interchangeable) are so far the easiest to recoil that I've seen. Extremely close to actual rebuildables. Neither of the heads can be replaced with juice in the tank, while on the Kanger T2 you can. On the T2 the ato head connection leaks if juice is filled above it, while the other two are sealed very well. The heads and the battery must be screwed pretty tight on both the Nova and the Stardust, or the coil does not get a contact.
Regarding the post by "media" above, it could make sense that the tighter draw lets the Stardust create slightly more vapor with a smaller battery. I also noticed that removing the small metal cone at the top of the ato head does free up the airflow slightly. That makes it essentially a Vivi Nova head.
Vivi Nova and the Stardust replaceable are built very well, while the T2 does have some issues. I like the Vivi Nova design and decisions the most. Not sure if the Stardust cracking is an actual issue or just a one off.
Edit: I use 1.8 ohm heads on all of them.