I have a Garmin AOA in my C150. After 23 years in Naval Aviation, lots of loud music, my high frequency hearing loss makes it hard to hear the stall warning wearing a DC headset, and radio traffic. So the AOA is a visual backup. Chose the Garmin AOA because the indicator can be mounted on the glareshield in the left corner. And resembles the AOA indicators in Naval Aircraft, which works well for pilots getting back on a carrier deck. Keeps it in sight without going "heads down" looking at the panel on final.