Pretty good, but....... - SureFire X400V IRC Infrared Laser 350LM WeaponLight

The visible light, IR light, and IR laser work well. The on switch is a little stiff compared to the 'ol Streamlight TLR-1. The selector switch for laser, both, and light is easy enough to manipulate.

Adjusting the light from visible to IR needs to be done cautiously since this protrudes beyond the barrel. Probably something to be selected before drawing the firearm. There's an "off" position. Given there's a laser selector, I wonder how necessary this is. The on/off switch is stiff enough that it shouldn't go off easily.

Many Surefire and Streamlight lasers far enough below the barrel. The laser and point of impact basically correlate to a fixed distance. Closer or further distance will put the round higher or lower. This will require practice at the range and learning how to adjust for very close, 10 yards, 20 yards, etc. Should work with every suppressor on the market.

This may or may not be compatible with all holsters. An RMR and a visible/IR light might also be another option, which might be easier for kydex holster selection.

Other than that, it works exactly how it's supposed to work. I'd definitely put it on a pistol like the M9 where an RMR isn't really an option.