The large windshield is both a blessing and a curse. We loved it in the mountains, hated it in Gila Bend, AZ when it was 110 degrees
Properly engineering the cab for a one-piece windshield was not successfully accomplished by all manufacturers early on in the one-piece windshield craze. One of the major builders (forgot who) had/has recurring problems with the glass breaking due to stresses and twisting in the front frame.
As far as I know, Winnie engineers did their homework well and their units have not had these kinds of problems when they went to one-piece.
I was actually considering having the factory convert our coach to one-piece from our two-piece, but in chatting with them decided it would be somewhat difficult (read expensive) since the front cab frame would need to be modified.