I'm very skeptical of glass shop guys since my favorite glass shop went out of business several years ago. So under the recommendation of my insurance company, I used Safelite local guys here when a rock chunked the wife's 2016 CTS windshield. They have different "grades" of windshields. They have their brand, they also had the Pilkington brand which is "OEM equivalent" and then they could also install a GM windshield. After talking to a few insurance folks about the "OEM equivalent" they told me that it was basically the same windshield but had the "GM" logo ground off of it. But because of liabilities, ALL windshields they install must meet MINIMUM safety requirements. Not that it made me feel all that much better. And the Pilkington glass without the GM logo was a bit cheaper.
I have all that camera junk for road sensing stuff so the insurance company told me I'd be better off getting the GM windshield since they said they'd be ok with covering a factory style. Sure enough, they put a factory windshield in. I watched them in the shop when they got it in from the dealership truck (snagged the GM part number off the box too because apparently Cadillac has different part number windshields for whatever reason) and they did an excellent job overall. No cost to me for the glass and install, but it would have been almost $800 for that joker done out the door. Been over a year and a half and no issues at all. The b*tch was that I had to pay the dealership to recalibrate the lane sensor and collision sensor cameras. So that was an EXTRA $200 out of my pocket. Found out the dealership uses Safelite to do their windshields, so even having the dealer do it would have ended up in the same place.
Again, I'm usually vary wary of places like Safelite, but their techs did a very good job for me. Kept all the car covered in the right places, and worked in a very clean shop. I have nothing to b*tch about and I'm pretty anal about doing the crap right.