Image quality would depend on how well the monitor performs scaling. Any monitor can only display at it's native resolution. So any input resolution that doesn't match the native resolution gets scaled to match the native solution (higher or lower) for display.
As for refresh rate, I'd suspect flickering at lower rates (60 is standard for PC use). But I've not tested to verify. And that's assuming the LG will accept 30.
As for refresh rate, I'd suspect flickering at lower rates (60 is standard for PC use). But I've not tested to verify. And that's assuming the LG will accept 30.