We have one, but I still use the regular coffee maker in the mornings for both me and my wife. I imagine it's cheaper that way instead of me using up k-cups. I've experimented with our Kurig when filling larger cups (travel mugs), using 2 k-cups, and using the smaller cup setting to see how the strength varied...but I haven't done it enough to come to any one-way-is-best conclusion. I like a bolder coffee. So far the coffees I've liked are...pretty much all of them.
In no particular order:
Newman's extra bold
Caribou (ok, not the best)
Emeril's Big Easy
Donut shop was alright
One I just tried recently and liked because it was pretty bold compared to the others, using the same cup size setting, was the Timothy's Italian roast.
I haven't tried any of the teas, and we have a big box of the Green Mountain hazelnut decaf. That's for those that want decaf (not me), plus I don't like hazelnut.
It's a nice machine, and beats the others hands-down. And they are quiet. My parents switched to the Keurig over the other brand with the little plastic discs. That one is noisy.