I love the Zero and coils. I get about 1 month on a coil before it starts to get weak. I have never had one burn and i have been though probably over a dozen of these coils. They are ceramic and the Zero has temp control. You should never get a burnt hit. It just seems to get weaker and weaker as the weeks go by. Im guessing the other review that said they burnt out probably didnt wait at least 5 min before use after filling. I did forget to wait once and instantly got a bad taste, but not burnt. That coil constantly produced bad hits, but not burnt hits. i changed it after a day of use. That was my fault though.