I don't own one of these, but if I was in the market for a single cup coffee maker, I would probably get an AeroPress. The local coffee roaster (that roasts and blends the best coffee I've had) carries and recommends them, and I read a great review in Business Week (of all places).
The Aerobie® AeroPress® Coffee Maker
Keurig might be convenient, but it just can't compare to fresh roasted quality whole bean coffee that is ground just before brewing. We've gone through a number of coffee pots, and in my opinion the coffee makes a lot more difference than the pot. I'm also sold on thermal carafes, as keeping the coffee on heat deteriorates the coffee rather quickly. Not an issue for a single cup, though.