TO ALL:
Seriously, the Hornet Horn is pretty sweet. Got it a few months ago to mount on my road bike for long distance rides. I have an air horn on my mtn bike. They are completely different.
The Hornet is low profile, battery operated and offers to different setting. I have been testing it for a while. Did a ride with a bunch of folks in NYC and the horn did well.
The trigger system rocks. You can mount it anywhere, unlike the air horn. I have it mounted right underneath my hoods.
End of the day, the Hornet offers something different and it does work.