I just received my new 510 cartomizers in the mail today and all I can say is Wow. I filled 2 cartomizers up with my favorite Tasty Vapor juices and the flavor is amazing. I will never use an atomizer again. These things are fantastic. They hold 30 drops or so. Have been vaping for the past 4 hours and they are still going strong. No more topping off every 10 minutes, Woohoo. I just wanted to share my experience with all other 510 users. If you haven't tried them, you need to. 