I put an Aerovonics AV-20 in my RV-8 and a firend's Super Cub. Here are some panel shots:
At first I was skeptical about the usability of the unit due to the 2.25" format with the square display. But flying it in both aircraft has shown it to be very well behaved and the attitude solutions is dead on. I have flown the Sandia Quattro, the Garmin G5, the GDL 39 3D, the GDL 52 and the GRT Mini. This little AV-20 is as good or better than the best of them (and that previous list has some not so good stuff on it).
Having a second adhars on board allows a pretty good comparison. This unit would be an excellent choice for the likes of the Super Cub where a pilot in the bush might find themselves in deteriorating visibility or on top of a layer. Emergency conditions.
The TAS and density altitude are very nice. I don't pay attention to the AOA or G-meter functions.
I am pleased enough with the display and smooth operation that I ordered one for our Luscombe. I have also ordered and received two the 3 1/8" AV-30s which have far more features and connectivity to install in a Glasair III. Aerovonics has been great to work with.