IF you can, try and check the work before the installer leaves too. Sometimes it's not so much the quality of the glass, but the install as well.
My GX470 windshield that I was speaking of had to be done twice because the guy who did the first one totally biffed it.
I brought it back to the shop and after the manager looked at it for 3 seconds, He apologized and scheduled another job free of charge. the second go around came out flawless.