G900 users and guys thinking EFIS. When you buy Garmin you are dealing with the new King, with intended pun. They are probably now the leaders of most GA related equipment. When you deal with them you get a huge company with a perceived sense of reliability and dependability. What you also get is the FAA mandating certain things. They're very regimented in their thinking. They have certain things they want to see and don't want to see. The FAA is a little more lax with the experimental community ( they let you have engine monitoring on the EFIS), but still expect certain things Garmin can't deviate from.One of these things is probably software updates and the testing procedure. It's probably a pain in the ass. I think this is where a lot of ignoring of any recommendations or advice from the users comes from. Garmin can't budge either due to FAA, cost or both.
  If you  want to suggest or ask for something out of the ordinary or specific to your airframe, go with Advanced Flight Systems, Grand Rapids Tech, Dynon. These systems are geared toward the experimental community and are more open to suggestions or unusual requests.Their equipment is designed for a wide range of aircraft instead of just 5. In my experience all these companies are just as picky about their equipment as Garmin and they are generally as dependable. And they're mostly very nice to deal with.
  As to software, all software is the ultimate "black box" to most of us. All software should be completely tested in a flight environment, my opinion. I'm sure all the EFIS software guys do this. And there's still that bug that might crop up in an obscure situation that the testing guys didn't try.
I'm not an EFIS expert, just an installer. When you buy Garmin, you get some of the best. But you're stuck with what you get.

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Jon Hadlich
AI Systems
(541) 815-7381