All I use is the Boge cartos! I do find though when not used on a tank, they get a tighter draw after about 4-7 days and need to be cleaned. Then I can usually get another 4 days out of them and if lucky, one more cleaning and another 4 days. But on the tanks, they just seem to last a really long time without having to do a thing to them. Crystal Clear vaping is the best deal I have found on the Boge cartos! Their 15 deal is killer. The other thing I have noticed is that the cartos with the 801 threading seem to gunk up faster than the regular 510's.