My dad picked up a couple from Triumph during the NRA convention a couple of years ago. As someone above said, they work best if you have the ability to run more than one at a time. We use them in drills with IDPA type targets as well. The targets they use do force you to process the threat /...
It has been over a month since I've been able to make one because of working rotating days off, but I usually try to make the Thursday night shoots at GA Firing Line