Hi Bennett -- I do think the next few years will introduce some new partnerships and hopefully a more open hierarchy to integrating these boxes. The unfortunate part of GA is that many of us are not able to completely update completely at any one time. Even my recent upgrade was restricted because I could not afford to do the second nav, update the transponder and install ADSB. For all the reasons you love Garmin, I detest them. Not playing well in the sandbox is their MO and I don’t blame them. But it does want me to see other options other than theirs. BTW -- I did buy their 650.
I looked seriously at the G500/600 series PFD/MFD before buying the Aspen. The obvious observation with their solution was that they had no intention of allowing interfacing non-digital radios commonly found in our planes and often left in as people update in stages. When Aspen introduced the open hierarchy approach, this allowed older Nav/Coms like my Narco 12D+ to function fully on the Aspen HSI either directly or a secondary RMI type indicator, thus eliminating the need to keep a second CDI. Garmin apparently recognizing the threat this posed, introduced the GAD-43e to allow those interfaces. Of course, it would cost you another $5k.
As for the Garmin/Aspen relationship, I agree there is some tension. There should be. The gorilla in the market is being attacked by a chimp. And I for one am supporting the little primate. I have 4 solid months with my Aspen solution and I absolutely love it. Best bang for the buck since not only did it bring me into the 21st Century, it gave my old Nav/Comm a new lease on life.
Competition in the market is a healthy thing. It keeps the competition innovating and prices in check (but it still is expensive).
As for your “cabling” comments. If you are using the Garmin GDL39 without internal battery, you’re right, you would need to plug it in. My Nexus 7 will run the entire flight and then some on a single charge and I use the internal GPS to run the Garmin Pilot app – hence, no wires. The reason I brought up the Aspen ADSB solution (and I apologize because I now realize it was Bob with the Aspen) was that it appears that you can now use the certified ADSB box to get the same information you get on your 750/650 brought over not only to the Aspen displays, the 750/650 but also it will feed through WiFi the portable solution you may have on board.
Here is a picture of my Nexus in flight: