This light on my G22 and have had it about a year. This light is great. You won't find another light that is this sturdy and bright for this price. Nebo has some other really great products if you check out their website.
The only problem I have with it is that the side to suffer switch is easily activated when setting weapon on nightstand or in the dresser drawer. I found mine dead once due to this very thing.
As far as a holster goes I'm sure that its pretty close to some other mainstream lights in demensions. I have a guy that makes custom kydex for any gun and any light combo for right around 40 bucks.