hov sent me a couple of boge rbn cartos with my order to try. i've been using slotted cartos for ages and overall am happy enough with them. the idea of doing away with the priming is nice, but the reality doesn't seem to work for me. is anyone using the rbn cartos? if you are using them successfully, what vg ratio are you vaping? i'm thinking my high vg juice is too thick for them, despite it being quite warm and the juice being a bit thinner than it could be.