I'm by no means an expert, but I've used cartos exclusively for the last 9 months or so. If I take care of it, a carto lasts me up to 5 days. If I don't suck them completely dry (always add a few drops after a short stint of vaping), then they tend to gum up (hard to draw on) rather than burn up. I stick my 'bad' ones in a baggie and fill a new one when this happens. When I've accumulated a bunch, I dump them in a pot of boiling water for 5 minutes (no more), take them out & let them cool off, blow out the excess water and set them up to dry out for a day or so. Then they can be refilled and used again (almost like new). Sometimes I keep two setups going at once, so if I;m vaping heavily I don't need to drip into the carts as often. This forum and youtube tutorials have been invaluable to me. I've never used anything else but carts and I'm pretty satisfied.