I have been using the PACT club timer 3 for years, and used another PACT b-4 this one.....I instruct professionally and use them in that role and they have been an integral part of my personal training program for years....my normal practice session involves the use of timer to monitor my times on presentations, reloads, shots, etc as I "compete" against myself.....I know a lot of pro's who use the PACT timers in their courses of instruction and they are an integral part of our range kits. Good investment.