I think I've uncovered the truth behind all this. It says it all right here http://www.asus.com/news_show.aspx?id=12328 and I webquote "ASUS Puts New Twist on PC Gaming with First-of-its-kind Wireless Controller"
“An engineer explained to us that hundreds of ear impressions were gathered in the name of research, and while each one obviously boasted its own unique shape and size, one single characteristic remained uniform across the board: the entrance into the ear canal is not a perfect circle, it's an oval.”
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I think I've uncovered the truth behind all this. It says it all right here http://www.asus.com/news_show.aspx?id=12328 and I webquote "ASUS Puts New Twist on PC Gaming with First-of-its-kind Wireless Controller"