I dont know what training device you are talking about but I use the Crimson Trace on my SP101 to help with trigger control. It will let you know if you are doing anything wrong in a hurry. The dot will deflect when the hammer drops if you did anything wrong. I would forget the device and get a Crimson Trace grip.
Patron Member NRA
"I would not be an old man if I had not been an armed young man." JTJ
I was taught to respect my elders but they are getting harder to find.