I've got a set of the Weathertech headlight protectors (Lampgard) on mine and I love them. Easy to put on, great fit, good protection and look great. I bought them for both my headlights and fog lights. This is the third vehicle I've applied them to with excellent, long-lasting results on all of them. The material is made by 3M. Highly recommended.

Here's a link:

http://www.weathertech.com/store/veh...tem_group_id=2

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2005 X5 4.4 (Sterling on Truffle) w/sport everything
2011 Audi S4 (Prestige, DSG)
2012 Audi Q7 (Sport, S-Line)