4pksr all the way. Ive had mine for about 6 months now and its awesome, easy to navigate, and feels solid.
I had a mt4 before but couldnt use it because my fingers on the steering knob kept hitting the trims.
Then I bought a M12 and had it for a month before I sold it. I couldnt get used to navigating it. But it was ok...
I wouldnt mind trying a KO but it will have some big shoes to fill.