I'm interested in finding out what bike you've owned that you thought descended well. I also inspired to bring this after reading a post on Red Kite Prayer (an great website
http://redkiteprayer.com) reviewing the descending characteristics of a Tarmac and a Roubaix.
I'd especially like to hear from people who consider themselves competent or good descenders and who have also own multiple frames and compare those....i.e your CAAD9 vs Orca etc.