No shade needed here in Atlanta.
I will update my previous statement. Still no shade needed.
But it does let in a little bit of heat. Maybe one extra on the AC fan control on a bright day around noon. But not uncomfortable in the least. Not to mention that when the car is really hot I can open it up and let the hot air out really quickly (not that I ever forget to pre-heat/cool my car).
I love it, and wouldn't want a shade. Although it seems like we only had about 10 sunny days this summer. Rain every day.