A couple of years ago, thanks to Autobahn road works, I had to get a cracked windscreen replaced on my SLK32 when I got home.
Booking Autoglass was no problem and I left the car at their depot. Now, my car has an internal cellphone antenna attached to the glass and Autoglass had said that they would refit anything as required....
When I went back to collect the car, the OEM windscreen had been fitted OK, but the antenna was in the wrong place and was drooping down; also there were grubby handprints all over the inside of the windscreen.
I relocated the antenna myself, but the glue they'd used looked awful through the top of the windscreen - splodges of thick grey/black glue.
Basically a shoddy job performed with inadequate care. Quite why the idle slob couldn't have cleaned the glass after fitting it, given that they insist that customers wait an hour for the glue to bond, I do not know.
I was not impressed. Now that they have a virtual monopoly, I can't see their standards improving much.....