Sun - no problem, however a bulb behind my back or a light at the ceiling in refectory can be annoying. Not very often, so I cannot call it an issue, but it happens on rare occasions. That's my point. If it manages to annoy me on 505, and everybody says on 700 it is quite more noticeable, I cannot imagine how people can read on it.
I know, I am very demanding. When I read a printed book, I do not expect to adjust it to see better, so I expect the ebook reader to behave
I accept it as my personal problem