Eh, we have one but stopped using it after we got a French press. A Keurig might be nice when you're single, but when you make coffee for two it's kind of a pain in the ass. Especially when you want to use your own grounds instead of the overpriced K-cups because you have to take the thing out, clean it, and refill it for each cup.
On the other hand, one of the larger units with a big water reservoir might be a bit more convenient. Ours is a mini one that only holds enough water for one cup at a time so you have to clean it AND refill it for each cup. I guess if you always buy the cups and get one of the larger ones it might be nice. Not worth it IMO though.