i got both my screens replaced.
my rear had de-lam, not a lot, but enough on the corners to bother me + my de mister only cleared the middle section of the screen and didnt do a good job at that either.
I got both screens done under insurance, but and only paid the £75 excess.
Mind you i had to really speech the insurance to replace the rear, the front was a doddle.
when asked how much the rear was i choked.....£1200 was his answer. (obviously ask this question once you have passed the hurdle of getting it approved by the insurance company first lol)!!!
the rear screen is made from the company Sigla.
edit: insurance will give you the story of its not physically damaged and its general wear and tear, but a bit of talking did the trick for me.
..hint, try it before the winter period is over you have more of a case.