A client of mine dropped her iPad 3 from a counter top, shattering the screen and denting one of the corners.
It was pretty straight forward but be careful as not all microwave temperature settings are calibrated are the same.
Read the instructions for the temperature settings for your microwave so you don't burn the rice in the iOpener.
iPad 2/3/4 Display Bezel
iPad 3 and 4 Wi-Fi/Bluetooth Antenna
iPad 3 Screen Digitizer Assembly