I have a webasto aftermarket sunroof in my vehicle. Haven't had any problems with it. My only complaint is that it's not factory
When you look closely, you can tell it's aftermarket and you can see imperfections here and there in the headliner....Of course, it's the installer's fault, not webasto...but that's my only experience. If I had a choice right now, I would install a new one, and get someone to redo the whole headliner....but that's me...