I've got a Keurig Elite and love it. Got it for free through an online promotion. Oddly, the Elite is their low-end full size brewer, but I don't think you need much more than what it has to offer unless you need the purty stainless steel or variable temp controls.
I'm hesitant to comment on the quality of the coffee because everyone's taste is different and the dozens of varieties that are available make it difficult to accurately represent. But I can tell you that I'm a life long coffee drinker and, although I definitely enjoy a brewed pot with freshly ground beans, the convenience that the Keurig offers is very attractive. Seriously, my daughter usually makes the coffee for me and she's not even two years old...that's how easy it is. I just hold her over the machine and she takes it from there. Our guests gets a kick out of it.
I guess my two biggest cons are 1) the high cost per cup and 2) I hate the idea that I'm throwing something into a landfill every time I want a cup of coffee. I wish there was an way to make it more environmentally friendly.