I have exactly zero complaints about my 6 inch EZReader (Hanlin V3); it's performance is excellent, and it is reliable.
Relative to me, a fast reader with old eyes, and the font/font size I need for comfortable reading, I find myself 'turning' pages faster than I'd like. This is something fast readers might consider in their buying decisions; a larger screen displays more text. (BTW, I use 12 point Times on the 6".)
The company's next larger screen offering will likely be my next eBook reader, but I think I might miss the handy size of the one I have.
Kent Walters