Peter just asked, in a PM, for more info. We have been operating flawlessly for over three months - more or less daily flights. I love to demo this thing.
The internal Garmin intecom is the best I have flown in a door-open airplane. We still have not hooked the Stearman directly to the internal Garmin intercom, but that is imminent. The Garmin seems to know when wind noise is present, and mutes it slightly if it cannot automatically squelch it out. I do have it set up for ptt intercom, but have not used that feature except for demo.
The Cub is a battery- only aircraft. We are getting eight tach hours between battery charges. Running on battery voltage is considerably below the stated 14 1/2 volts the radio "requires", but we have full power and no complaints. The battery low indication is you cannot transmit. It is obvious the minute the finger hits the button. Then we change batteries for another eight hours, and charge the low one.
Setup is semi-involved. I programmed the bottom soft key to cycle through my memory, and the top soft key to do the same with the little knob on the right. Both are extremely useful in our frequency-saturated area. I mounted the radio in the wing root ahead of the rear spar, and can operate it from either seat. Much, much better than my SL-40 and PM-501. A joy to use.
If you use "monitor" I recommend going in to the factory settings, and making it shut off when you change frequencies.
We do have an RF problem locally - I expect to find a pair of antennae within five miles broadcasting on two frequencies, the difference of which is 125.7 Mhz. This radio is pretty sensitive, and may be picking up something on that frequency due to heterodyning. It has not been an operational problem, but it is peculiar to these radios.