Not trying to rain on anyone's parade but this is what my experence was...

I loved the straightness of the shafts, the strict specs and all, but I just never could get over how fragile they were compared to other carbons. Irealize weird things can happen to arrows when they miss the intended target but I had three of them split (it was more like a tear)on the nock end, one of which was shot into soft dirt.

Since then Len hasindictated his experience was not the same as mine, however I know that I was not the only person to comment on the frailty issue.Maybe the ACC bushing & nock(if I am understanding you right) are a key ingredient to their holding up. Mine were the CT Whitetail 65/80 shaft. Perhaps this problem has been addressed and solved I know not; it has been two years since I played with any.

In the end all that matters is that you are pleased with them and they work for you...