You are fortunated to have Allstate coverage with OEM glass! Coverages are greatly varied from State to State and Company to Company. Unfortunately it is in really tiny detail that none of us read until we need to use it.
By the way, got my done! They replaced it with Pilkington; it is supposedly the same manufacturer as the OEM.
Honestly, i cant really tell the diffrent! However, they did not replaced the rubber mould/trims on the side. I am going to purchase a set from Sewell to replace as they look a bit old and worn out.

Thank you eveyone for the feedback

 

What I meant by "it's just a piece of glass"--there's no sensors in it. It's just the windshield, whether it's OEM or aftermarket. The airbag crash sensors are in the front bumper, not in the windshield.

 

Unibody = 1 = anything welded, urethaned together is part of the structual unibody. All as 1. You need to understand how a unibody works in a crash. The entire unidody works in conjuntion to deminish damage to the passengers.