have a cheap-o madvapes vv box mod. I really like it, and love using it (as well as the $35 replacement cost), but the connector is too shallow for the dc tank cartos with the flange being where it is. The cartos fit my passthrough just fine, but I've learned to just enjoy my mod with basic cartos (not a problem for now).
Also, I've found that my combination of juices with high nic is about the only thing keeping me off cigs at the moment, so I reckon I'll just buy a case of cartos next week... better than buying a carton