I have had real good success with horozontal coil cartomizers which Boge cartomizers are. I have working will Bloog cartomizers for a while now. I have switched buying blanks to a company called Ikenvape but the only problem with there cartomizers, is that everybody found them at the same time and he is having problems keeping his stock in. He will sell out in a matter of hours so he is limiting is ordering to 15 of any type at a time. Personally I think they blow a way the Boge but that is my personal opinion. I can usually get a week out of a caromizer. The mega cartomizers usually hold righ about 3 ml or 60 drops while normal cartomizors will hold about 20 drops or 1 ml. I like to use a reg cartomizer when I vape anything sweet while tobacco flavors I will go with a LR cartomizer. Hope that helps
Paul