All I hear about is how great cartomizers are. I must be doing something wrong. Every carto I have tried will only last me about two or 3 fills then it's dead and will not fire any longer. I have heard them being vaped on for hours and how great they are. The few that I have tried (3) were not good. The first one I tried lasted about a day and when I filled it I got juice in my mouth and it was not a fun experiance. Then I tried another on 6v and tasted horrible and died quickly. Then I tried again on 3.7 and got about two fills out of it and it died. I tried filling by removing the cap and dripping (bad idea) then I filled using the cap method and the same thing mouth full of juice. I have two left here I am bringing with me to the meet up on Saturday perhaps somebody can show me what I am missing with these things. BTW thanks for the extra gear Carl! I appreciate it! I found out that I do not care for 6v on a 510 but love it with a 901.