Don't know the rating method, but....
At the bottom of this site is a supposed comparison of the methods for plugging in the iPod. These people are supposed to have a direct connection early next year, but as with all other products like this, seeing is believing. And since we haven't seen anything yet....
http://www.mp3yourcar.com/
2004 Volvo XC70 - Ruby Red Metallic/Graphite Leather, Premium, Touring, Bi-Xenon, Bluetooth, and iPod Direct Connect
2011 Honda Pilot EX-L - Silver Metallic/Grey Leather
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