Like many other reviewers, I have tried a myriad of fillable coffee pods. I've cannibalized various products to create what my wife called "Frankencups". I've tried combinations of used K-cups, filters, filters with flaps, mix and matched lids with cups, and pre-punctured many lids. Finally I created something that worked but the result was a weaker than expected cup of coffee and holding the machines "head" unit down tight was necessary. Even after all that, I had to clean up many of the reusable pieces. Then, these ifill cups showed up on Prime Day deals- probably suggested because of all the previous products I've purchased and tried. For me, it is a game changer. As soon as they arrived, I was impressed by the packaging and the quality of the ifill cups. I immediately filled one with an espresso grind, 2x caffeine coffee. The lid sealed like it was some tight tolerance machined part. A nice solid feel. I threw it in my K-cup Express machine and started to hold the lid of the machine down tight to keep excess water from mixing with coffee. I had to stop myself and see if these cups would produce a single stream of coffee. EUREKA ! It worked flawlessly. I savored my very first decent cup of coffee made with ANY fillable cup. I checked the ifillsystems website and saw they have a brewer. My thinking is if their brewer is anything like the pods, I must get one. I think these guys in WA State are taking their coffee seriously and probably got frustrated like many of us. I'm good with that. They've done it RIGHT. The price may be a bit higher than other "solutions" but it's worth avoiding the mess and frustration while still being cheaper than mass marketed K-cups with quality coffee. I forgot to apply my mantra: "Buy the best, cry only once" -OR- "You get what you pay for". Thanks. I'll be setting up a subscription for these cups. Great Job !