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I have a Kenwood KMR-558BT. The display was hard to read no matter what color I changed it to. I finally realized that it was the reflection of the tank dash that was making it hard to see. I took some flat black sticker vinyl and put a piece on the dash and it helped a lot.
I've also notice the color of shirt that I have on affects how well I can see the screen as well. I can always see the volume and the dancing EQ pretty easily on the Sony. That's pretty much all that matters to me.