I had a look at the Cirrus website this morning and was somewhat surpised at the complicated glass screens and the number of knobs and tits with which the cockpit of this VFR-only aeroplane is encumbered. All that eye-candy in a VFR-only environment which is supposed to be 'see and avoid'??
Good HMI means elegant simplicity, not overcomplicated displays with awkward input devices, layers of menus and sub-menus. The very last thing you need in a single pilot VMC aeroplane.
I always remember my 'car test' rules of thumb - how easy is it to:
1. Reset the clock and
2. Change the radio station.......
I never did find out how to change the station on a hire car I once had in Germany - after 10 minutes of beeps and admonishment from the display, I gave up. A Mercedes I once used, whilst mine was being serviced, had a clock which showed the wrong time. It took me 10 minutes of faffing to find out how to reset it!