These are very nice of all you want is K Cup coffee. They do a good job.
BUT:
At least some of them have a problem that is they run out of water, they could overheat and become unusable. After I had one replaced for that, I was very careful to make sure I had enough water.
They don’t handle San Francisco Bay Coffee compostable OneCUP capsules perfectly, although they do work. San Francisco Bay Coffee provides a blue adapter ring with every package, but I think that it still doesn’t work quite right. They are, however, useable.