I have always loved the Turbos. I got the metallic ones instead of the black this time because they were sold out of the black. They work pretty well on my defender, but for some reason they don't work at all on the Bloog ecig, which is a KR808-D as far as I know. Other carts have always worked on the Bloog. So I'm not sure if this is the cart's (or maybe just the metallic ones) or the ecig's fault. Anyone know? Kind of frustrating to have 25 carts I can't use on both my 808Ds.