I feel you. One of my Boulder pals was a 777 check pilot and his Cessna 310 still ran on steam gauges. He just bought a Cessna 320 wants my help upgrading the panel. That will be a fun exercise! He'll probably go all Garmin, which is fine. Good luck with your 540. I think the major diff between the 540 and my 550 is the synth vision. Honestly, I never use the synth vision feature as I already have synth vision on my iPad with ForeFlight connected to a Stratus!