With that, are there brands/models I should shy away from? As a general rule, so to speak?
I assume you are asking this question with respect to avionics and not aircraft manufacturers.
I'll fully admit that I'm a Garmin fan for a lot of reasons.
1. Intuitive user interface
2. Handsome looking hardware
3. Great customer support (flat rate repairs)
4. Resale value
5. THE best installation manuals
6. THE best back shells for connectors
7. The company isn't going anywhere
8. Plays well with other equipment
9. Better engineering from a systems/programming standpoint
10. Better warranty experience
Now, some here may disagree with this next assertion, but please understand that I'm making it from my own set of experiences:
Stay away from Avidyne. In my experience, the sales/product managers don't have enough experience to intelligently understand when I call with an issue that could not be resolved by their troubleshooting section... This should tell you a lot since most troubleshooting sections are rudimentary.
Moreover, their warranty process is atrocious. I once had a customer needing a repair on an Entegra MFD. The L5 bezel key was not working so I couldn't properly configure the unit after installing an NGT9000R in place of the outgoing TRC497 in a Cirrus. Called and explained the issue. She said I needed to call someone else so I did. That person sent me a multi-page deal that felt like filling out a tax form. Essentially, I had to do a job that they should be doing. Sent that back. Didn't hear back for a full week. Called again. Talked to two different people. They said that since the warranty expired the customer would have to renew the warranty ($10,000) and it would be a 60-day turn. Or, $20,000 and a 30-day turn. Those numbers didn't even include the repair itself. After much back and forth the customer renewed the warranty for ten grand. Then we waited 60 days for an RMA. Sent the unit, got it back to weeks later. I don't remember the cost of the repair itself because by this point I needed the airplane done.
.......Intermission......
I reinstalled the MFD and the button was working, but the option specified in the installation manual did not exist in the TAWS page. Additionally, the GPWS was loosing its sh** and would not test. Called them back to ask why so many systems were unhappy. They insisted it was a wiring issue; a response I anticipated. When I explained exactly how it was interfaced and sent them photos of the configurations and pin verifications I essentially got the silent treatment. They didn't know what to do.
So I called Cirrus. They were as helpful as they could be but couldn't quite solve it with me. But they did give me a name of a guy that used to work at Cirrus that now worked for Avidyne. I called him and explained everything. He pointed me in the right direction to solve the problem but the rest I would have to figure out with my trusty supervisor (a very intelligent man). We had to buy a software upgrade. Avidyne never mentioned that. There's even more $$.
When the issue persisted after the software installation, even my supervisor was stumped. But I remembered something I learned before I ever worked on avionics that helped me diagnose a problem with the serial communication. The software upgrade caused a baud rate mismatch between the L3 box and the TAWS feature on the Entegra. This was another issue that the phone answerer at Avidyne just could not comprehend. I needed the baud rate to stay at 38400 not 9600 (might've been the other way around but you get the idea).
Ultimately, I was able to resolve the issue with serial communication.
But wait, there's more! We needed another antenna!...This is the straw that broke the back of a very ornery camel.
See, the rep had been the one that convinced us that this L3 box was the best solution for the customer because it wouldn't require an antenna and made it sound like a plug and play deal. It was not.
The customer was very understanding about the whole thing, but my supervisor and I had a chat over a beer toward the end of the job and both agreed that we couldn't charge this guy more than the cost of the job. It wasn't his fault any of this happened any more than it was ours. So we made no money on him. I just wanted him to have his plane back and working the way we promised it would based on what we were assured by the rep.
We also agreed that neither of us would recommend an Avidyne unit to another customer even though we were a dealer. That's a whole different story too...something about "we don't have you listed as a dealer anymore because you didn't buy enough stuff from us." That game. My supervisor effectively said, "make a product I can sell and not lose money on and that people actually want in their airplane."
Anyway, now that the lines are blown out on that story of frustration, I thank you for allowing me to burden you with it.
I am happy that others have had much better experiences with their products than I had, but I'll never do business with them again.
I should add that I'm no longer working with/as/for an avionics shop so I have no motive to push you toward one brand over another save for the hope that you and your shop can avoid a similar adventure.
If you have any other questions I'd be happy to help you however I can. I don't have all the answers, but I'll do my best for you. And in case the other readers here aren't keen on reading mini novels like this, you're welcome to shoot me a PM anytime.
Hope this helps in some way