I bought this machine over a year ago on the advice of several friends who RAVED about the Keurig. I was a bit skeptical about a coffee maker that cost over $100, but finally splurged. Now I recommend them too!
We have two adults in our family, and usually each of us just have one cup of coffee a day. For us this is perfect. I don't like all the plastic waste of the K cups, but for the convenience of it, we use them. We tried using the my k cup filter and didn't like it. I like the wide variety of K cups we can get, have tried many different ones. I've discovered I don't enjoy the flavoured coffees much; while they're tasty, they're weaker in the coffee flavour. I stick with the coffee flavoured coffee. :)
From what I've read, a common problem is the machine brewing short cups. And sure enough, this started happening to us too, about a year after we bought it. We were able to fix it once or twice using advince we found online, but finally (after the warranty was done!) it seemed to be permanently giving short cups, you have to run it twice to get your cup full.
I called Keurig without much hope of it being resolved, since the warranty period had expired. At best I was thinking I'd be able to buy an expensive part instead of buying a whole new machine. They are very professional, walked me through some troubleshooting to try to resolve the issue, and we weren't able to fix it.
But to my surprise, they are sending me a new replacement unit! I didn't expect that at all, but they stand behind their product even after the warranty period is over. I'm EXTREMELY pleased, both with the coffee and the customer service. Great product, great company!