My DH just ordered a Keurig K425S on sale at Sam's Club online. It has just been delivered, so we have yet to try it. It's a Keurig 2.0 model that brews K-cups, K-mugs and K-caraffes.
I ordered my oldest DD and her DH a Keurig K200 for Christmas. We shall see how it goes for them.
After much careful research, my DH and I determined that all of the Keurigs have about the same customer rating. Most people don't like it if you can't use non-Keurig cups. Ours comes with a reusable K-cup, so no worries there. Some complainers say they quit working after a while. I don't know if that's from user error (maybe they don't clean the machines as often as they're supposed to) or what, but my DH and I paid an extra $14 to get 4 more additional years of warranty coverage. We're premium Sam's Club members, so we get additional years on our extended warranties. I highly suggest buying more coverage, just in case.
I have always made coffee for my DH using the old-fashioned drip method like my mother alwaus did. I do not use a machine. However, my DH wanted a Keurig, so he ordered one.