I have a TLR2 on my G19. It's sighted at 10 yards. The worst off it can be from point blank to 25 yards is 1 inch vertically. That means that there will be a hole in the BGs chest, just maybe an inch high or low. And I can bring that red dot on target quickly, and the tac light makes sure I know what/who I'm looking at.
Most of my shooting is with it turned off though. I want to be able to shoot without the laser because, well, I really want to improve basic skills, hone basic skills and NOT depend on something that has a possibilty of failure, however remote that possibility may be. I've just always thought that basic and simple is always best. Then the laser can come into play as an aid, not a crutch.
JMNSHO &, of course, YMMV