I believe that I'm correct in saying that many mil fast jets are flown on AoA. In fact IIRC final approach in the Jaguar is 8 Alpha.
I suppose that you use the stall warner in a C15x to ensure that it goes silent as soon as you unload once the rudder has bitten, what with all that plan-form drag and a slow entry speed it would be buzzing for days, otherwise!
Kirstey - if it really was a safety aid, don't you think that they'd have been fitted at Lockhaven? How many other light aircraft have them as standard fit? You and most pilots however have an in-built AoA indicator, your inate ability to recognise the onset of a stall as aerodynamic buffet or tailplane burble is felt. Still not sure? - then go get more stall/spin awareness training until you are sure.
I can see it being a distraction and if not properly calibrated either a useless or a dangerous distraction! Hope old QDM didn't pay too much for his gizmo.
Stik