the customs are not worth the extra cash. tc builds some fine barrels. i have had 3 contenders and 3 encores and ALL of them except one were tack drivers, and by that i mean less an half inch groups with regularity. did they shoot in the .1's? no, but .350" to .5" were and are common.
the only one which was not a tack driver was a .223 barrel that i did not shoot well...but in TC's defense I did not try to find a load for it. I only had it because i wanted the frame it came on...that barrel did not lock up well, and did not shoot accurately. who knows, maybe I could have made up some reloads and it would have shot great. i only had that one a week anyway.
-Matt