I love viva nova tanks, I use a mini and a standard size pretty much all day, great throat hit, great vaper and decent taste, I hear people all the time having problems, I had a few dry hits on mine out the box on the bigger nova, cut two small triangles out the plastic stopper on the head were the wicks feed, golden, I can now chain vape and do back to back hits with no issues at all, they must be great tanks, as they are in most peoples arsenal, and they get cloned, they only clone tanks that sell well, and they do sell very well, when u buy a tank for under £10 expect to do a little mod from time to time, if u don't want to do that then pay £130 for a kayfun, but even those can need attention, less likely though, you have to research these things I am afraid, I know I did, as I don't like to buy other peoples coils, making my own has stopped all the problems