It all depends on what you want out of the trigger. Do you want it softer, smoother, less travel or all of the above.

The softer part can be easily obtained by simply  installing a reduced power firing pin spring and a lighter discconnect spring. This does not hurt reliability of the strike

The smoother part can be obtained by a simple polishing. It takes 10 minutes or so and if done by a knowledgable person . you see feel a difference.

The travel issue can be cured with a Lone Wolf ultimate trigger stop. It replaces the ejector and has an adjustable screw in it that makes contact with the trigger bar. With an allen key the user can adjust how much travel his trigger has.  This part should really only be installed on a range gun though.

J