I watched many highsides in motogp and WSBK this year and the last but I can't remember a single airbag opening. I know they have chips to analyze the g-force change but how can it be that the airbag protection is never required in all those crashes?
The hit-air vests are more widely used this year in my trackdays organization and I hear positive feedback from riders: it seems to help against neck strain, chest and also collar bone injuries.