A 2000 Millenia was the first sunroof-equipped vehicle I ever purchased. For more than two decades, I drove it about with the sunroof open "some" of the time, but rarely. It was completely trouble-free for me. Sunroofs are standard on all three of my Mazdas at the moment. My 2006 Mazda3 is the eldest, and on sunny days I open the sunroof on a frequent basis, especially on the commute home from work. There has never been an issue; in fact, I have never given it any special attention in terms of upkeep. Because I couldn't care less about having a sunroof, I had planned to get a base model without one when I purchased my 2020 CX-30. Unfortunately, the top Premium model was the only one available in the colour I really liked—Polymetal Grey. I now have a second sunroof. From time to time, I've opened it without any problems. I just purchased a CX-50 with a sunroof. I have owned it since mid-December, but I haven't driven it 2,000 miles yet. I think I've opened it once. Oddly enough, the sliding panel seems to just lift up and slide outside beyond the fixed panel in the back. Its slanted position made me think of a spoiler. I don't really need a sunroof most of the time, but it does add some comfort and I've never had any issues with it.