The CS does a good job on prime rib. I did a search for prime rib in "All Open Forums" 161 matches. Here are a couple of places to start:
http://forum.cookshackamerica.com/cgi-bin/ultimatebb.cg...;f=3;t=003041#000000
http://forum.cookshackamerica.com/cgi-bin/ultimatebb.cg...;f=4;t=000293#000000
http://forum.cookshackamerica.com/cgi-bin/ultimatebb.cg...f=15;t=001321#000000
good luck