Which would you buy?

[larrylamb]

Having had 2 vans without it & one with, I would specify it again, the biggest improvement seems to be at high speed on the motorway, it cuts out more of the wind noise around the door mirrors.

I'll second this, my first Cali 2015 SE came with acoustic glass as part of a package it was very quiet in the cabin especially as Andy says at motorway speeds.