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When I had it on my last C5 I found myself staring up at trees and buildings every time I had to stop at a light. And the tint on it is so dark that the sun doesn't glare as much as you would think. It's the one option I wish I had on my C6.
We haven't driven a C6 in hot weather, but the transparent top on our C5 was excellent- good visibility and it brightened up the interior, but we never got sunburn with it in place. The only time we ever felt the sun was on a 5 hour drive in bright sun with the outside temp reading 105'-107'F. So I put on my hat.