I have this case with the usb keyboard (as listed above from the amazon link)
Its an ok case. The keyboard is nice, and a general netbook style keyboard. However the little holders that hold the tablet into place are a pain. They are supposed to be adjustable so the slip and slide all over the place and use the resistance of the casing to keep it in place. The USB keyboard works fine, but not any better than any other keyboard. I got tired of the case and only really bought it cause I thought it was a neat concept. Not the keyboard is more or less just a backup usb keyboard for any use. Its a good case, but not one that will take a beating. The holders are prone to being bend and angled wrong. I added velcro to the closure flap cause it doesnt hold very well.
Overall 6/10 for the case. Use some velcro on the case the make things more secure.