For what it's worth if you have a glass claim and you're insured under Hagerty, they'll let you choose who does the work and the glass. I mention this because I got a couple of rock chips in the windshield of my CL600 a few weeks ago, and in discussions with Hagerty about how to handle the claim, they pretty much told me to find someone to do the work with my preferred materials and submit the bill for reimbursement.
I have "Fuyao" (or whatever they are) windshields in the 2008 ML550 and 2003 E320. Both, as new, out of the box, look like they're sandblasted when you look through them in direct bright sunlight. The techs that installed them said they're fine, but I griped enough about the one in the ML550 that they came by and polished it with some cerium oxide. Made little difference, the windshields are still garbage.
Next time I'm going with OE or Pilkington. That will definitely be the case with the CL600.
-D