I think it is a case of the cockpit that you use it in. The iPad has proven to be easy to read in sunlight as the backlight is amazing. In my high wing Cessna it is perfectly readable and the same in the Dornier. I should imagine in a fishbowl type low wing like a TB20 or a DA40 that the reflections without a screen protector would make it more reflection sensitive. The screen protector that I used on the unit is actually quite matte but I preferred it glossy so removed it.
As I said, probably horses for courses, but my experience so far has been very good. I will report as I progress with it.