Amazing coil life. 45ml vaped & still good flavor. Zero burnt hits. Today I noticed the flavor is now slightly muted. Just refilled again. Enjoying so much I received my 2nd Caliburn today. I've used all different types of devices. Rda..rdta..rta..sub ohm tanks...mtl tanks and 6 different pod systems. I'm still a newer vaper about one year but I highly recommend the Uwell Caliburn.