After a week or so of ownership my experience is that visibility out the rear window is no problem. Side view visibility is also fine. I agree with cmyX6go that changing lanes to the right takes some getting used to due to the C pillar

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2011 X6 xDrive50i - Titanium Silver/Black Nevada/Bamboo.
Loaded except: Smartphone Int, Heated Rear Seats, Rear Ent, Lane Dep, SC Doors, 20" Wheels
2008 Aston Martin Vantage - Black/Black
Loaded