I used the vision top coil clearos for the first year and 3/4 of vaping and got used to the drill of cleaning them and doing dry burns to make them last a good long while. Tried the replacable coil in the vision without any lasting benefits though and leak issues. I then tried and liked the Kanger T2 clearos from Kanger and thought I had better vape mist and flavor from them but wasn't nimble enough to clean and dry burn the heads so just bought a handful of coils and just replaced them as they got weak (Imay go back to this clearo). I ordered the Kanger T3s back in April and liked them so much in the first day that I bought 5 of them and 50 coils. Needless to say I found the coils to be great for 24 hours or so and then they had to be trashed. In the last month I've tried the Aspire, updated vision clearos (top and bottom coil), Kanger Aero tank and Kanger T3D plus a Vape Only that seems to be doing OK. at least at first.. Wisely I've only bought a few coils of each model. I'm not happy with the life of any of them. I'm wondering if the manufacturers are building lack of longevity into all of them to keep us buying at this point and as much as I like vaping when everything works right is how much I dislike vaping when it doesn't work right.!!!!F R U S T R A T E D!!!!!!.