I bought my first vivi nova when i started vaping 3 months ago and with a rinsing out under hot after each tank i have yet to replace a head. I did rebuild one to a higher ohmage and that is the only thing i have done. I nfact i like them so much i have purchased 3 more of them. If you rotate heads and clean them they should last indefinitely. Another thing you might look at is some of the rebuildable tank systems if you like to tinker that way if a coil goes out you just make another and vape on and you get the satisfaction of knowing that you made it yourself.