
The camera has been out for around two years. The only time I've heard of the rear dial not working was when moisture got in it via rain, or in one instance sweat! Other than that this is a very popular and reliable model. The only thing that would concern me is if Amazon ships repacks. You know, items that have been returned by one customer and than repacked and shipped out to another with minimal checking. That could account for the defective dial. I've never heard of one having that problem straight out of the box but that doesn't mean it doesn't happen.
I'm glad you've never heard of it because I've ordered a replacement. This one's going back - I hope no one else get's stuck with it