Same here - tried CE2s, eGo carto, Joye 510s, SLB 510s, KR-808 3.2 ohms from Britain, and have a SMOK dual coil carto on its way in the mail, but the Boge ones are great. Boge has come out with a 3.5ml carto for its LEO e-cig too, they are very nice to use and long-lasting.