I'll just add something here, I was using Vaporesso Ccell .6 coils, exactly what you mentioned, before I moved to rebuildables and although I loved the flavor and longevity of those coils I found the quality dropped substantially in my last couple months of using them. 1 in 3 coils would have a burnt after taste even though I was OCD about my priming process and other coils in the pack primed identically were fine. The last pack I bought was garbage. Every single coil was bad, this is what turned me to building. IMO Vaporesso is a good company that makes some solid products, they make other GT coils that are not ceramic that you can use in your tank, I do believe they're having major quality issues with the ceramic. I haven't been a member of this forum for long and you're the third person I've replied to having the same issue with the ceramic coils. BTW, welcome! You'll find a lot of good knowledgable people here.