My folks have a Keurig and they love it. I used it while home and it was nice. It holds enough water so you don't have to refill it every day. There are a lot of variety to the pods, even teas (black, herbal, green, sweet, etc.) and hot chocolate in different flavors.
My dad likes a couple of the coffees, but not others. He had a few on hand, so I got to try 4-5 different ones. I usually drank the ones he didn't like, but I thought they were quite good. I like Starbucks, he likes instant (used to anyway- yuck) so he was able to get rid of those he doesn't like.
It was really easy to use and took very little time. Write to Keurig and suggest biodegradable cups. Couldn't hurt.
My mom wanted to get us one, but we rarely drink coffee and we like to make a pot of tea in our regular coffee pot and use it for iced tea for the week. I like green tea and just pop a mug in the microwave for 2 minutes. I think it would have just been wasted on us. In the past, when I drank 1-2 cups of coffee a day, I think I would have liked the Keurig.