I bought a -F (clone, for $84 via AliExpress) and received it a couple of weeks ago. It is FAR, FAR nicer to use (meaning "see" or "read" than the standard 2.8 inch model I've had since last October. The -F is much larger physically, and much heavier, though. Mostly because it has a very sturdy-feeling metal case and a 'large' 5,000 mA hr battery. Unfortunately, I don't know if it's worth double the price of an H4, but I'm very satisfied.
