I bought a Sig Sauer P229 .40 some time ago. I took it to the range and ran a box of .40's through it, and just did not like the aiming system. My model did not have adjustable sights, unless you call using a $170 tool and replacing sights to adjust for aim. On a whim I thought I would try one of the Crimson Trace laser grips. My least favorite pistol has all of sudden become my favorite by a good margin. I have used lasers before, but I have never had such incredibly good results. I feel like a marksman compared to my previous efforts. Even my friend who was at the range improved his targeting, from looking like a shotgun at a 100 yards, to a very respectable grouping. I am just a consumer, not a reseller, but I will have to give the CT a 5 out of 5 stars. It even held aim when swapped on the .22 slide. If you have the means, I highly recommend it.