Had mine replaced by Autoglass on my E90 - the auto wipers were never as good (read that, as sensitive) as beforehand. But they did do a good job, didn't scratch anything and tidied up.
If you want OEM glass from your dealer I'm pretty sure they'll only pay the first £x towards it and the OEM windscreen is v expensive. Hope you get it sorted
F25 xDrive 20d M Sport in Alpine White, Pro Nav, Auto 'Box, 19" Wheels, Visibility Pack, Heated Seats, Reverse Cam w/ Top View, Sun Protection Glass, DAB radio