I never did provide an update, so...
As previously mentioned, I've had the Crimson Trace LG-469 mated to my XDs .45 pistol for a while now.
Amazon.com: Crimson Trace LG-469 Semi-Auto Pistl: Sports & Outdoors
I primarily keep my setup in a Remora "no clip" IWB holster (model 6ART). The XDs and laser fit great in this holster.
Remora Series 6ART Holster (IWB)
At the range...
I primarily carry the XDs with the default, smaller 5-round magazine. I have large hands so my pinkie has nothing to grip in this configuration. Pre laser, I was fooling myself sometimes by placing my left index finger in front of the trigger guard to help steady the XDs. I can no longer do that with the laser and have worked on my grip.
At 10 yards the laser is easy to see, and any shaking is slightly amplified by the distance to the target. At 25 yards the laser can be difficult to see and any shaking is much more pronounced on the target. I don't think this is a problem though since I bought the laser for a more likely situation of a short distance (7 yards or less) and no time to aim with the traditional sights on the slide.
The laser is easy to align (both vertically and horizontally) using the provided allen wrench. I have not had any problems where the laser became misaligned or it stopped working. I have shot 400+ rounds with the laser attached to my XDs.
Overall, I would buy the laser again and I do recommend it for XDs owners in either .45 ACP or 9mm.
Peter