I put this great little site on a HW40, and it works very well. The reticles are all useable, look like they are supposed to, and are bright. The only downside is that under 15 yards there is still some parallax present.
Pros: Multiple reticles, light, bright, easy to use
Cons: Parallax still present at under 15 yards
This review was written in the old system and had content requirements that are different than reviews written today.