How about a pirep on the GDL82?
Both installation and your experience with using it.
That one's on my short list when it's time to ADS/B-up.
The installation was straight forward. I mounted the UAT box high on the kickpanel on the same side as my existing Becker Mode C transponder. The coax that did go to the antenna, from the transponder, now goes into the box along with a coax out of the box to the blade antenna and a coax in from the new WAAS GPS. They say blade antennas work best with ADS-B.
The box proper has power in and ground. Two options are for a switched ground wire that puts the ADS-B Out into an anonymous mode when squawking 1200. The other option is a warning light if the unit isn't performing properly. Simple stuff to wire.
There is also a provision for a squat switch, that I didn't use. And there are pins for RS-232 WAAS GPS input if you already have a suitable GPS source. Or this unit will also feed position data to a GPS display if needed. None of this was needed for my installation.
The Out data is broadcast on 978 only. Some ADS-B transponders also broadcast on 1090. I think that's only important if you're planning to be above 18,000 feet or flying outside of North America.
The weight penalty is about 2.5 pounds for the box, additional coax and two antennas.
In use it seems to be working fine. As I mentioned I got into the FAA site and requested a performance report. It showed me it was outputting everything correctly. The avionics shop I bought this from ran tests too and it showed the same after they programmed it. And this includes the anonymous mode.
When I'm in an ADS-B tower coverage area I'm getting traffic uplinks to my GDL 39 3D/796.
The short answer it was easy to install and is performing as it should. I put this in an experimental and my avionics shop was willing to sell me the unit and let me install it. And afterwards they programmed it and ran tests.