I love the sunroof in my new car. It lets in so much light. And air. It's fun to wave to people raising one arm UP out the top window instead of dangerously out the side window towards closely passing objects, like streetcars, or cyclists. It also creates a bit more noise which requires me to crank up the music very loud.
You should however, be very careful about what you store in the back seat when you are driving with the sunroof open. Mostly, it should be okay. But if the stop and go traffic suddenly goes, and you proceed without much thought, well, cyclonic action can happen.
To the people driving behind me on the highway earlier, I apologize for the fireworks of brightly coloured tissue paper.