I have to align myself with those that dislike the TT/TH.
Years of carring a USAF issue 15 with them, I could never understand why target accesories were ordered on a combat weapon.
Fortunately, some of the armorers at different bases I was stationed at felt the same way and would install my .312 smooth combat trigger and semi target hammer on my issue 15. Of course I just happened to have them available.
For single action target work they are great. Not for defensive or combat shooting.
I much prefer a smooth, non grooved trigger for fast double action work.