these a couple of weeks ago after seeing several really good reviews for it and I have to say that it is every bit as good as everyone says. The Solofill Refillable K-Cup for the Keurig just rocks. I was actually perfectly happy with the MyKCup that came with my Keurig, but it was kind of a pain to clean out and it was also a pain to store. The Solofill K-Cup is the same size as other K-Cups so you can store it in the same way you store any of your K-Cups. It's also one single unit, with a built-in filter, so it cleans much easier.
The awesome thing about this (or even the MyKCup) is that it can save you a ton of money because you can use whatever coffee you like in it. It also helps save the environment because you aren't throwing away a piece of plastic every time you make a cup of coffee.