We actually use a Keurig gourmet coffee maker at our office and it seems to be a big hit. Very simple to use and no mess involved either, just throw away the empty coffee cartridges and it always taste just right. I've also tried the Flavia machines which was also in our office, briefly though. That one was too complex and the coffee wasn't as tasty either. In the end I think Keurig is on top of the single cup coffee maker game.