For you guys that actually own a BP 7" diversity screen...... Just how good/bad are they on a very sunny day? I have trawled the internet but the reviews are not that specific on viewability in the sun! I KNOW they are never going to be perfect but the 7" screen I have at the moment is rated at 450cd brightness and 500:1 contrast ratio but....... I'm not all that happy with it on a sunny day (even with the sunshield in place. Does the rated extra 200:1 contrast on the Black Pearl make it useable and bearable in the midday sun? Thanks in advance.