Sunroofs were common on cars before Air con was "normal". I found them noisy and a reliability issue so have never missed them. Cars built to be open (SLKs, MGs etc) are great, but anything else is too compromised when the get a hole chopped into it. IMO of course.
I’m really after first hand experience of this roof...
Then you would be better off going to the company and seeing if they can put you in touch with previous customers. This is a 9 year old thread and from what I gather the Original Poster didn’t go ahead with it and Looking back he’s not been on the forum in 7 years anyway.
You maybe waiting a very long time for someone with first hand experience.