After being on backorder at 2 places, and being sent the wrong unit from another, I finally found one, and just got it today. pulled it out of the box and slapped it on my USP 45. First impressions: this is pretty sweet. It is completley programable , Low profile, and actually fits in a holster! (USP owners know the pain) Both the Laser, and light will strobe, and constant on or any combination thereof. I had a TLR-2 on my usp for years, and the thing Hung off the GG&G rail adapter like a ton of bricks. This X5L is lighter, brighter, and much more user friendly, And it fits in most generic holsters on my USP with the Adapter! I am very exited to get some trigger time with it!