I'm guessing the problem with overheating is not as wide spread as believed but I did see it happen to my friend while flying in his Commander 112. It wasn't in direct sunlight but we were flying here in SC and it was a hot day.
Nice thing was I could see where we were and it was only about 70 miles back to the home airport. We followed the interstate and could see the upper and lower lakes so it was pretty easy to navigate our way back.
I iPad finally cooled down and worked again but I came to the conclusion that an unreliable set up like that wasn't for me. I use and highly recommend the iFly GPS. Of course opinions are like arm pits ... everyone has a couple that stink.