So I like my pockeX, but I thought of an improvement. The problem with a lot of the miniature or all-in-one devices is that the coil can get slippery on the bottom, so that when you unscrew the top to refill, the coil can come out at the same time causing all of the oil to spill into the charged chamber. So I realized a pretty easy solution... To refill it upside down like the Nautilus clearomizer. If you put a pin in the cap, across the coil, so that the whole assembly came out rather than just the top refill would be easy. Putting a thicker rubber seal would prevent the chamber/cylinder from leaking when turned over. With the liquid making the threads of the coil slick, this seems like a real improvement.