Vivi Novas are okay as long as you remember to tilt and swirl regularly to get the juice to the coil. I'm like the other's though, my Vivi haven't been used since I tried bottom coils. The Protank is the best, followed closely by an AnyVape mega BCC that I just got from Viper-vape. It's hard to beat an EVOD on an eGo, though. Perfect performance and they look great together, too.