Someone asked about the Vision Stone 3s. I can attest they are great! No leaking whatsoever, which was a problem with the VS2s. No futzing around with slotting cartos and no syringes needed. Plus, for about $3 you can replace the innards, which are a CE2 type coil on top of a post in a cup. They wick good, way better than the VS2's, especially with juice over 50% PG. Plus, they cost about the same as those crappy Smoketech DCT tanks. I've gotten a solid month so far on the one I use all day, every day. When you want to change flavors, you just rinse them out with hot water and give them a quick dry burn. The post screws into the base and is gasketed, so there are no leaks through the battery post. The top screws off and also has a gasket, so no leaks there. The base screws off as well and has yet to leak on me. They have all the advantages of a CE2, clean taste etc., hold about 3-4ml, and look cool as well. The only problem with them is if you hold them upside down a lot, they can flood and gurgle, so you'll have to blow them out. Also, they're constantly out of stock. Sorry for the fanboyism, but I've wasted a lot of time and money screwing around with carto tanks that are a giant pain in the .... and, in the end, still taste like you're vaping from a carto.