Re the D10A, I find the display plenty bright, was a little wary of this also. I have an RV6, slider, with flat/med black panel, normal amount of hood overhang, also flat/med black. There are no other glossy surfaces in cockpit where light could be reflected, bounced around. I have operated the D10A on cloudless and cloudy days, up to 11,500', no readability problems. It is probably a little easier for me to read than some of the finer detail of my GPS 296 moving map, located center panel. I do find that I have reduced sensitivity to light, i.e. really don't need sunglasses as much as I used to, yet the brightness is easily enough. Results may vary by user, cockpit config/decor, etc., but what I've observed.