I don't have any trouble seeing mine at all ... regardless of wearing sunglasses or not. Sometimes it is a little bright out, but even in a convertible I am extremely happy with it.
I also don't think it is any different to look at the dash 6in lower than if I had one (ex. garmin) attatched to the windshield. Both units are just as helpful, I have been saved by a garmin in other vehicles many-a-times.
Good luck!
