The concept is perfect, if the design could follow suit. I have been a loyal juul user for 3 years and today will be the last day. For 3 years I have been buying pods and dealing with the fact that at least 2 out of 4 leak out completely. I continuously replace the devices because after the pods leak into them, they never work right again. I am now buying 2 devices a month and throwing away several pods a week. I get that the occasional pod may leak, but 50% is unacceptable. Throwing away money is not something I can do anymore. Time to move on to another option. This is such a disappointment because I really did love the idea and convenience. Such a shame they can’t make a reliable product.