What exactly "sucks"? Just the reset, the pull weight, grity pull, etc.? I used a SRT kit for a little while on a P226. I found it to be okay. While it shortened reset it really did nothing for trigger pull weight or smoothness. I have since gone back to a regular trigger mech and instead do the following:
If it's an older gun without the plastic mainspring seat:
Plastic Mainspring Seat (P/N 34280445)
Hammer Strut for plastic mainspring seat (.45 - P/N 34221155 or 9mm/.40/357 - P/N 34280446)
Wolff 19lb mainspring (hammer spring)
If it's a new gun already set up with the plastic mainspring seat:
Wolff 19lb mainspring (hammer spring)
I then do the following as outlined in the attached PDF document. It has made all the trigger pulls on all 4 of the guns I did it to extremely smooth. Given it takes more work but it does a much better job I feel than just dropping in roughly machined/cast/forged/mim parts.