Unfortunately in the description it's not clear that different resolutions are only avaiable for free downloads. It doesn't make much sense because selling pics with different resolutions have usually different prices.
Very simple to use, social bookmarking and organization of competitions are fine.
A good extension with an intuitive backend, very good extension for joomla new users, but not useful for selling images. I really hope that the developer will take a look into the "download/different resolutions/different prices" function!!