TexasCHLforum.com

I don't know if Gabe Suarez is one of the trainers you were referring to in the OP, but he does ban them from his training courses. He lays out his reasons, NDs among them here:
http://warriortalk.com/showthread.php?t ... ight=serpa" onclick="window.open(this.href);return false;

here:
http://warriortalk.com/showthread.php?t ... ight=serpa" onclick="window.open(this.href);return false;

and here:
http://warriortalk.com/showthread.php?t ... ight=serpa" onclick="window.open(this.href);return false;
Among noteworthy points:

In fact, the gun was so tightly held in the holster that, with one person applying both hands to the release button and another person applying two hands to the pistol, the gun could not be freed. Upon inspection, a small piece of gravel, approximately the size of the head of a pin, had managed to work itself into the Serpa release button and wedge the lock in place.

This also appeared recently:
http://warriortalk.com/showthread.php?t ... ight=serpa" onclick="window.open(this.href);return false; referencing problems a police agency encountered.

I have never used on, but it does seem a bad idea to assign a second function to the trigger finger. I am happy with my CTAC, and don't see a reason to change.


Good luck.