I will caveat my original comment with the fact that the AOA is only as good as the calibration, and that is very important.
The Dynon uses a series of increasingly interesting manoeuvres culminating with full power stalls.
Now, with my mature Brother squealing like a girl as I am eaking the last drop out of the poor, complaining airplane, we finished the calibration.....
Full power stalls in an RV are quite interesting.
I digress - what you end up with is a superb tool to help you in all areas of flight, not just approach.
This year, biennial flight revues in the UK are featuring crosswind stalls in the pattern - distraction during the climb out can be as dangerous as the base turn/final situation.
It is interesting to watch the AOA as you are doing aeros - it gives you a real impression as to what is happening - particularly on the back side of looping figures - sadly the statistics show too many accidents where guys pull too hard on the back side of a loop and flick out.
I will try and set up my GoPro soon and see if we can get some footage.