BTW, Aviation Consumer has a
review of the IFD540 in the March issue. They seemed to be focusing on whether you should upgrade from a 530W to an IFD540, though, rather than how this unit compares to a 750.
For instance: In their green/red "stoplight" summary, the red item was, "If you only use a fraction of your GNS530's features, skip the IFD540." Well, duh. If all you use your panel mount GPS for is "direct, direct, enter", then whatever you have will work. That's a comment about the pilot rather than the box, though.
I was also surprised by how dated some of the article was. Avidyne was already working on the next two versions of the software when the unit was released (and publicly communicating the content of those releases), but there is no mention of that in the review. Regarding another coming improvement, one paragraph reads, "The 540 has inactive Bluetooth and Wi-Fi that's being saved for future connections. Could a keyboard be one of them?" Yes, in fact. It was announced over a month ago that all current and future owners would get a keyboard with their unit; a demo video is now available on YouTube, here:
https://www.youtube.com/watch?v=7p8d6EpdGpI
The biggest complaint the author seemed to have was in how "inefficient" the map was. Fonts are too big, symbols are too large, lines are too thick, he says. I dunno...maybe compared to a 750? He doesn't say. (Again I've never used one, so I don't know.) Coming from a 430W, the map feels fine to me. It's very easy to zoom in and out, so if there ever was some clutter I needed to resolve, I think a couple of quick pinch-zooms or dial spins (I haven't decided yet which I prefer) would let me see what i wanted to and get back to the overview. There are also declutter buttons always available to quickly select the amount of map and overlay data you want. Again, I think this is a personal preference point, and I don't particularly agree with his complaints, there. I've never heard that concern expressed on the Avidyne user forums, either, and there have been plenty of comments/suggestions there for how to make the box better (which Avidyne listens to, btw.)