Vaporcone I was told was designed by a guy from Lansing specifically for oil. I have tried most listed, very pleased with how well the Vaporcone Elite works, how well it has held up from multiple drops, how you just fill a chamber and no cartridge and no need for accuracy when filling, it can hold a lot, doesn't need to be hit with the pen upright, battery lasts over a week with a dozen or more daily tokes, rubber mouth tip, case and usb charger, you can lock the pen by hitting the button 5x to prevent unwanted usage, the price was right, everyone just thinks it's another e-cig.