For any cocoa/obj-c dev that's dealt with constant deprecated API's on Mac, they know exactly what I'm talking about.
By your own admission that's not "in order to compel you to upgrade to the newer." That's because the newer hardware is required to make it work satisfactorily.
AirParrot has additional features like sending only one specific application window to the ATV and control over quality.
Beamer lets you seamlessly stream any kind of movie format you want and also gives control over subtitles.
Both work all the way back on 10.6. I don't suppose you could give me any advantages of Apple-branded AirPlay Mirroring huh?
http://arstechnica.com/apple/2012/07/mountain-lion-airplay-m...
Tried Airparrot - quality was terrible in comparison.