I use genuine Joye 510 cartos from either LiteCigUSA or Cignot, and have used them for about 9 months. Unlike discussions about having to fill them using a syringe, I fill them by dripping into the battery end. I like them because they usually seem to hold a little more juice (about 1.1 ml), and the coil is located in a receptacle at the battery end...like what I think is a horizontal coil type of arrangement. I have gotten a "dry-vape" when they are low on juice and need refilling, but not experienced that sudden sharp burning taste as I have with Boges (vertical coil). The draw-back, though, that I have only just recently experienced is clogging after about 2 days. I haven't determined yet whether it's now a carto problem, or my juice...even though I've also used the same juice for the same length of time. All just a thought.