Once again I've seem to stir the pot a bit. But it's turned into a good read. I have an Icom in the Kitfox that is as simple as it gets. It has flip flop and a tuning knob. I like that! I wouldn't even begin to trust my iphone for navigation. But I also know an ipad in the sun is almost impossible to see. So that screen on the SP400 may be a good deal.
The perfect radio controls for me would be a switch from nav to comm and then just push in the freq then enter. Is the SP400 about that easy?