particleman - 2:14 am on Feb 2, 2008 (gmt 0)
We've used it for a few months now. I can count the times people have used it on my fingers and toes if that tells you anything. Seems paypal or normal CC processing is still king. The transaction fee discounts are nice for us big adwords spenders if people would use it. The badge is a nice incentive too, although we need to get it working first.