I've used a few now, and would agree if there's a color display it's going to wash out to a degree in direct sunlight. The ones that come with the Bafang mid drives seem to be the least affected. I'd rate them an 8 or 9 of 10. Others are nearly useless.... washing out just about completely, to the point they're difficult to read anything at a glance.
The aftermarket color KT-LCD8H that come from KT aren't too bad (they work only with KT controllers), but I agree with Harry above. Given the option of an LCD-3 display and their color LCD8H, after trying the LCD8H, I'm using LCD-3's. Not seeing the value of the extra money spent for color here at all. -Al