I traveled to China this summer, and in the Shanghai airport they use a very similar system to get quick feedback on customers' satisfaction with the customs ag

I traveled to China this summer, and in the Shanghai airport they use a very similar system to get quick feedback on customers' satisfaction with the customs agents. At each station, there's a little box with 3-4 buttons ranging from :-) to :-| to :-(. (For example: http://bit.ly/aoSXgP http://bit.ly/aoSXgP)