I have thought about buying the springs but I do carry my P89 for concealed carry and was worried somewhat about reliablity. I have had trouble with my SP101 with Wolff springs, as well as a Taurus Tracker I used to own. The trigger return spring on my SP101 I had to leave stock or it would sometimes not return the trigger fast enough to reset it, and had to use the heaviest Wolff mainspring, so it really did no improve it much. The Taurus would work fine single action but not fire sometimes double action. I have used their springs in my single actions with complete satisifaction. Now, however, I just clip a coil or two from the mainspring of my single actions and unhook one of the trigger return spring "legs" and it works just fine (and don't cost my cheap butt nothing either!)