STO 3-WAY
I wish I could have gotten a better picture but this was as good as I could do.  Anyway, this is the STO 3-way.  The really only reason I got this was to take off some of the brass on the gun.  I hate brass.  After I got the STO 3-way, I noticed a smoother trigger pull, but that is it.  The stock one is just as good, and the only reason I would recommend this is to make your gun look better.  All you really need on your cocker is a new 45 frame, a barrel, and a revolution hopper.  In all, all of the guys at my proshop say it is the fastest, and I like my pull better than my friends KAPP and Shocktech 3-way, so if you are in the market for a new 3-way, STO is the way to go.