I only used carts for a very short time before going all direct-drip. I seem to blow through attys like crazy. I have no idea if it's related or not, but I only get a couple of weeks out of an atty it seems. Most of them still work, but the flavor and vapor amount is so poor that I need to just replace it. I would imagine that dripping would gunk up more easily on the coil, just because of the amount of juice that would coat the coil per drop...? I don't know, I'm just wasting time I suppose, no real info from me, sorry! LoL!