Originally Posted by st7860
at the beijing airport at both the arrival customs area and the depature customs area, there are buttons below the kiosk of EACH customs officer that you can push to rate the service you received from that officer (5 choices)
Originally Posted by
Sopwith
Do you push the button before or after you receive the service?

It's after. Since they implemented this new system, dealings with China Customs/Immigration has been extremely professional and, dare I say, pleasant?
One time, they thanked me after I pressed the button. Made me wonder if they saw which one I pressed.