I refuse to buy anything with a "combat grip." Def
It's neat to have for lights with tail switch. I like to pinch it with index and middle finger and control switch with thumb, and the grip would make it easier to hold it without slipping.
If I had the dough I'd definately get one, not he optimus thou, but the 400 lumen invictus in your last picture. IMO there is simply no better way to control the output than the rotating ring by surefire.
Combat grip doesn't mean it's used as a weapon. You hold it like a cigar, use thumb pad to control switch, while use both hands to shoot your handgun.
But is the gun filled with tactical water?