So many of them leak some time down the road if not at first. They do not have them that run internal so if open, those stick up over the back of the roof. Those that might be internal take headroom away. None I have seen fit the curve of the roof real good. Very few people do them.
I would not buy a Mustang with a sunroof unless it was really special and the price was real cheap.......
Just my opinion.....