Hi Folks,
I'm a big fan of the Vivi-Nova and also have a need to get my post-count up so I thought I'd share my experiences in case they are of any use...
I have a MK1 and a MK2 - the newer atomizer heads with the short wicks are a massive improvement on the originals and I now use these on both tanks at 2.8 ohms. I haven't found a great deal of difference in the draw with either and have no desire to change it - I am happy with a slightly tighter draw but I find it much looser than, say, a Bud tank which was what I mostly used before I got the Vivis.
For me, the Vivi is very good indeed but I suspect that results will vary a lot depending on your liquid and preferred wattage. For the record, I mix my own liquid which means that I can adjust the flavouring for different devices. It is PG-based with either 20 or 30% VG and I use flavourings with very little colour. I'm also not a big fan of high wattage/voltage/temperatures and my sweet-spot with the 2.8 ohm is around 4-4.2V on my LT. With a 3.7V device, the 2.4 ohm head would probably give a similar result.
The only maintenance I do is to clean the atomizer head every 2-3 tank-fulls (or when I notice the flavour dropping off. I just rinse it in hot water and then dry-burn until no more smoke comes off and it is ready to go again. Doing this, I have kept the same atomizer going since the beginning of June,
vaping 3ml a day, practically every day. It still shows no sign of flagging which is pretty good for a part that cost £2.95.
As I say, if you want to use thicker/darker liquids and run it at higher watts, you may well get completely different results and burn throgh atomizers a lot quicker than I do. But, for me, it beats the Bud, DCT, CE2 (don't like those at all) and the Imist (too airy for me). I think it also gives a SR Boge Cartomizer a run for its money, without the hassle of having to top-up all the time.