As others have said, seems pretty sketchy to me. I flew a club glider recently that had a white Kobo as the primary Nav device. Very distracting to have white reflections in the canopy. I can't imagine a completely white panel with the cutouts for instruments having dark faces. I expect that "mottling" would be very obvious in the reflections on the canopy. You'll notice many people go beyond flat black paint and coat the tops of their glareshields with black felt which is even less reflective. There's a good reason they go to the trouble...

P3