Got an X2L for my Beretta PX4sc and it's a slick little device.
The light isn't as bright as the larger units that Insight makes, but it's surprisingly adequate. You can focus the beam to get it where you want it too, and while not 'blinding' the little light is really hard to stare at.
Has a few modes: momentary on, steady on, light only. You can't do 'laser only' which kind of bummed me out, but it's pretty easy to take out the bulb and the unit will still work with laser only. Plan on using it like that for range work.