The bottom line here is they're very valuable IF you like them, and not worth spit if you don't.
The target trigger is great for single action work, not so hot for double. The target hammer is also helpful single action----and doesn't make any difference double action. The target grips are great----if they happen to fit your hand---and not so hot if they don't.
Another bottom line is if you're a shooter, you're missing a good bet if you don't get some custom grips made to fit your hand----REALLY missing a good bet!!
It ain't likely you wear clothes that don't fit you----why shoot guns that don't fit you?
Ralph Tremaine
Edited to add: There was a time---a long time ago when I had one of the early Chiefs Special Targets, and one of its baby brothers, a 2" .22 Kit Gun----- ridiculous little guns on the one hand, but ones you could shoot very accurately---at 25 and 50 yards---it you were of a mind to do so. I was of a mind to do so---after ridiculing the posted low scores at Bullseye matches by bragging I could do better than that with my "snub nose". This all started off as just me showing off. It didn't take long for challenges to arise with remarks such as "Oh yeah, for how much?"----and we were off to the races!! I used a little bit of the money I won to buy some J frame target grips---and they helped me to win more money. Then I used some more of the money I won to buy some more grips, custom made to order---and made to fit my hand. They helped to get folks to stop challenging me. I didn't know whether to laugh or cry! These things work---no matter what sort of gun you're using----small, medium, or large!!