I no longer use safelite. the last 1 i had in my focus was replaced due to a "wave" right across the viewing area, i've also had this with an oem too.
do not look at it in the shop, take it outside in natural ight and sit in it as you usually would. look up, down, left right, and then move forward and backward. if there seems to be anything wierd about it do not accept the work.
the one windshield I had was actually so bad that the bounce from the joints in the road made me sea sick due to the wave in the glass. the wave caused sort of a magnifying effect