I have been around lasers for many years now as an LEO and gunsmith.  I have used them personally, and feel like they give you a distinct advantage in certain situations.  I was however, new to the green lasers put out by Viridian.  They are simply awesome.  The green laser is incredibly easy to see in day or night conditions.

Jim at Mossy Creek Arms has several of these in stock including the C5L which is an incredible laser light combo featuring the green laser and a 100 lumen light.  It is compact and will fit virtually any handgun with a rail.  We are working on a video review right now for the C5L.  I think you are really going to like it.  If you are interested contact Jim and let him work you an unbelievable deal.