Have been vaping with the Epower 14650 and CE2 carto for about a year. I am a chain vaper usually using the darker juice, as I like the tobacco and coffee flavors, a 50/50 mix at 10 mg nic. I prefer a non-filler carto and like the clear ones so I can see when I am getting low. Getting ready to stock up on some cartos and was wondering if something better has come along in the last year. Dual coil, bottom coil and all those other terms are Greek to me and not sure what to look for in regards to a carto for an Epower. Any suggestions would be appreciated.