We’ve had this thing long enough now to be able to give it two enthusiastic thumbs up. The k-cups are the go-to for a quick cup but we’ve had success with the adapters, shown in the foreground, using our own grounds. They even make little-bitty filters for them that are optional. They do cut down on the cup sediments.
I did some looking on line for the cheapest k-cups and ended up running to Best Buy where they had some pretty cheap. Green Mountain Dark Magic is a dark roast that we like, and they had a good tasting Donut Shop blend that was also on sale at the time. Since our visit they’ve bumped up the price on both. I’ve ordered a couple of different blends from Amazon that are very popular: A Kona blend and one from San Francisco Coffee called Fog Chaser.