Without the power to survive an impact while traveling at mach one, let alone the power to fly, I would say there is exactly no purpose whatsoever given that you couldn't control it in any way whatsoever.

Jiro, you have to come up with another seemingly useless power! And I just realised that it's power, not device, so my one was rather pointless. Oops. I'll come up with another one, then: The ability to grow your hair exactly 25% faster than normal.