Mantis-X trainer (firearm, fire)

[LesLucid]

I have a birthday coming up and this seems like a really nifty little gadget. It attaches to the rail on your firearm and connects to an app in your iPhone. It monitors and reports the type and degree of movement in the firearm just prior to discharge. My slow fire is good but when I start picking up the pace, I suffer. Seems like a good way to diagnose problems. Has anyone else here used one to diagnose rapid fire/double tap shooting?

https://mantisx.com/products/mantisx