Except that Google's forums don't help when Google locked five figures from you on a spiky day, continues to accept money with no way to withdraw, provides no telephone support, and offers only an (apparently overloaded) email support. (Eventually I got my account unlocked and funds released... six months later.)
Coincidentally, I've never had such a problem with Paypal. (My gripes with them generally revolve around the glacially slow history search.)
That was two years ago and it's not worth the effort. It's better just to explain the moral of my story when Paypal vs. Google Checkout debates occur: Paypal at least has a phone line.
Hi, may we help? :) We also do have forums that are actively monitored.
Also if anyone is interested, checkout is present in these countries: http://goo.gl/I49QQ