But, this thread is about the reusable k-cups. I've been using the same 4 reusable k-cups for about 2 years. I fill them with Trader Joe's coffee (beans that I grind myself). Good coffee, low cost per cup.
I won't buy a Keurig, although I have used one and it is convenient. It's just that, if you spend the money for a Keurig, and if you use 3 K-cups per day for a year, the money you have spent on coffee would buy you a new set of irons.
Besides, a $19.95 Mr. Coffee makes coffee that is just as good, and if you use Folgers or Maxwell House ground coffee, it costs about 10 cents a cup, vs 60 or 70 cents a cup for the K-cups. Do the math. If you drink 3 cups of coffee a day, at 70 cents a cup, that's $766 a year just for the coffee, not counting the cost of the machine.
And if you put your own ground coffee in a Keurig, what's the point? Why not just get a $9.95 single cup coffee maker?
70 cents for a cup of coffee doesn't sound like much, but it's 70 cents 2 or 3 times a day, every single day, that's a lot of money for coffee when a Mr. Coffee will give you just as good a cup of coffee for 10 cents a cup!