May be too good - Mantis X X2 Shooting Performance System

The MantisX is easy to install and synch. I'm a senior who needs a 10-yr old for most of my electronics but was up and running in 10 minutes (including time to read the instructions). It must have a rail to attach to which limits which weapons it can play with. On a P229R dry firing it works as advertised, diagnosing my all-too errant trigger finger with the same ills my weekly coach has been harping on. At the range it's just as ruthless, recording every time my finger, grip, or wrists stray. But it also shows me that when I work on those things the errors decrease over the course of a range session. The only drawback? That memory - it remembers everything!!