Angle of Attack Indicator?!

I was just looking through a magazine and noticed an angle of attack indicator. Has anyone ever installed one of these in their bushplanes? Does it work well? It sounds like a pretty good safety thing. How much does it cost installed? You can see it at www.alphasystemsaoa.com.

Todd, are you there?!

Last I knew none of the AOA Systems out there were certified for our airplane. Most require a field approval and that is almost impossible to get. Besides who wants to sit around a camp fire and tell tall tales of getting into that short strip with the aid of their angle of attack indicator.