I have the G3X Touch in an all Garmin system, GTN750, but a GRT Mini as the if all else fails independent backup. I love it, and find it completely easy and intuitive. The autopilot in particular is fabulous, I swear if it were not illegal, you could fly Cat III approaches with it, solidly delivering you within 5 feet of the center line every time. The envelope AP protection feature is also a great safety item. What I particularly like is the commonality and interfacing with the certified Garmin pieces. The physical build is just like the cert stuff, same knobs, buttons, same style and level of documentation. And the graphics, in my opinion, are more transport category style.
If ever in Chicago, stop by for a ride!
That said, others like the Dynons just as well...
Reinhard Metz