I have a wacom one it's 6x9 inches (150x210mm). I bought it a few years ago when I was screwing around with web site images. They are really hard to get used to and you need the hands of a surgeon to get the best out of them. This one registers pressure on the pen as well as movement. The hardest thing I found was knowing when the pen was close enough to the tablet for it to register. Moving the mouse across the screen to click buttons in PS was a true pain in the butt. It's had a book on it for about a year now but I notice Windows 7 autodetected it and it still works
