I finally installed ADSB last week. I chose Uavonics Echo UAT/ SkyFX. OUT/IN. Flew and Passed the FED test first time with no squawks. Very easy install with only two wires (power&ground). Hooked up to iPad/iPhone using Seattle Avionics “Q Fly” software for flight planning, traffic and weather.
I used the “switched” battery master solenoid with 3 amp in line fuse for “power” and battery negative for “ground”. I would recommend this unit.