Just got my vivi nova BDC and can't recommend it enough. I've previously used a few different clearos: innokin iclears, protank 2, kanger t3s and this is by far the best clearo I've ever used. Using it on an evic v2.
Bottom dual coil and comes with 1.8ohm coils built in. Was amazed as soon as I fired it up... no gurgling sounds, no leaking, and a healthy crackling noise as it heats up the juice. The first thing I noticed was that I could vape at a high wattage without any burnt taste whatsoever. I tried vaping between 7-10.5 watts and even in the higher wattage range I noticed no burnt taste. The protank 2 and kanger t3s throw off a burnt taste in these high VW/VV ranges.
I'm assuming because of the extra surface area of the coils I get huge amounts of vapor with this clearo. It's a huge improvement over the iclear/protank/t3. Great flavor that doesn't taste as muted as with the other clearos I've tried. These seem really well built. Can't recommend these enough. I would never use another clearo after trying these. I've heard some people see a need to adjust the bottom contact points of the coils, I didn't need to do this.
Just my experience. I'm somewhat new at this so I apologize if my review appears novice.