Mainly I'm interested in booking an award on Air France. I love their First/Business on the newer planes.
I'm hesitant to transfer to KLM/AF directly because there are less opportunities to get bonus miles through an online mall (although this would be ideal if I could shop on NW's mall and earn AF miles since I live in the US).
CO has some great deals though like 5miles per dollar at Barnes & Noble.
I'm just not sure how easy booking awards on CO is.