To expand on one of the reasons I chose the Avidyne IFD-440, besides the trivial install (literally minutes to slide in and configure), the IFD-100 iPad app is like having another navigator, with a larger screen. It does everything the 440 does except transmit and receive COM. It's not just a mirror.
So I can have a large map with flight plan showing on the iPad, and have the textual route on the 440.
In my case, I am going to mount an iPad Mini 4 in the center panel, and will take care of most of my functional use there.
Also, loading a full route clearance with the knob is so quick, it's silly - once you get used to it! Great user interface design.
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All that said, I am still not done "unlearning" the 430W's "buttonology," and if the 650 had mirrored the 430's logic, I might've been tempted to go that way. But it didn't, and I wasn't.