We just bought the 21" wacom for retouching and it's really nice to work with. But I found it quite hard to calibrate, compared to our eizos (210 and 211) and it is a pitty that it's not a hardware calibration. Using the Eye One Photo, I could not get a profile that I would trust totally, some strange things going on, especially in the shadows. So I will only use it for retouching but not for color critical work, which will still be done on the eizo 211. But it is a really nice addition, and it will keep my hand warm in winter :-)
cheers,
martin.