I cannot speak to that specific light, just pistol weapon lights in general.
I am now a fan of the concept. With some caveats.
- The muzzle should preferably extend beyond the light. This prevents (in my experience) the light's lens from getting covered in smoke, reducing the illumination.
- Practice using it is required to train muscle memory. Not just turning it on as part of the draw, but also turning it off with appropriate timing.
They also most often require a holster design for both the gun and the particular light combination. And they do add bulk, which can be undesirable for concealed carry. If I were to add one to a compact or sub compact pistol - rather than extending the barrel length as I have done on my G20 - I would buy a more compact light than I currently own, which is a Streamlight TLR-1.
I actually have one on the G20, and another that floats between a G23 and a G22. It's too big on the G23 to take advantage of the reduced size of that pistol versus the G22 for any kind of concealment. So smaller would certainly be better.