Do you believe the claim that Google Checkout users click on ads more when the ad displays the Checkout badge and convert more than shoppers who have not used Checkout in the past?

[Ron Callari]

Google Checkout affirms that users click on ads 10% more when the ad displays the Checkout badge and convert 40% more than shoppers who have not used Checkout in the past. Is this verifiable in the real world? Any case studies to support?