I'm using the Kanger subtank mini with the RBA deck and the longest time I got out of a coil was almost 8 months. I was changing the wick every few weeks. It's easy to learn how, and I can replace the wick and be up and running in less than ten minutes. I really prefer the flavor versus the premade coils, and the cotton is a lot cheaper. Sent from my Nexus 6 using Tapatalk