Just to weigh in. I have an earlier Microaire M760 from 2004 or
2005. At first it worked great. Then I had an issue with distortion
in my transmit. I returned it to Eire Aviation (http://
www.erieaviation.com/radio.htm) in 2007 for some mods. Things got a
little better. I then hear about some other mods and sent it back to
Eire again and since then my radio have been perfect. I have been
told that the mods had to do with loose or bad grounds that either 1)
happen over time or 2) we related to "bad" designs.

The point of all this is the Microaire has been updating their design
quite often and providing those updates to their dealers. This is all
for the good. Also, Eire Aviation has been great working with. Quick
and professional.

My $0.02.

- John DeRosa