I just changed over from using Kanger T3's to a Mini Nova and have to say I prefer them a lot. The only thing I dislike is the need to sometimes give it a bit of a tilt to make sure the wicks are soaked but other than that it seems to perform better than the T3's, which at first I loved but after time performance decreases and also they tend to leak a little. However I have only been using the Mini Nova for a few days so can't report on long term use yet.
Vivi Nova does not work with all batteries. I have two Ego-t batteries, it works on one and I have to use an adaptor om the other. I also needed an adaptor on the Lavatube.