My wife's 500 has the sun roof and I find it does impinge on the head room (I'm 6' 3") and I have to put the seat back a little lower than I normally like it to accommodate it.
We live in South Africa and one problem we do have is the shade covering to stop the sun light. The sun still scorches us through it. We were just discussing today about getting a very dark window tinting put on it to try and stop us getting sunburnt whilst driving.