I have used some dark and thick juices on an atomizer with my vmod xl and it lasted weeks. 100% vg serendipity. I use the vapage atomizers, trying some others that work good too. The mini cartos seems to last a bit longer than the normal ones too. I would say try to get a Reo grand on the classifieds if you already have 18650s and a charger. Or get a vmod a la carte during a sale for a cheap entry level bottom feeder. I love both my vmod and reo but I plan on getting into the rebuildable game