Not used mine much but when the "auto zoom" is enabled when it zooms there seems to be a 2 to 3 second lag (screen redraws) before its usable again??
Disabling zoom seems to work but?? hey ho.
My only criticism is that the screen can be very/almost impossible to read in bright sunlight. I've tried all sorts of sun visors with limited success, so a good audio connection is essential.