I don' t know exactly what you' re referin to witht eh uni-nock. I' ve probly seen ' em just don' t know ' em by name. But the best nock I' ve found, in my opinion, is the AAE Z-nock. I like the way it clicks onto the string verses Bohning T-nocks and traditional nocks. I' ve been bitin the prongs on the traditional nocks to get a bit of a click, but I reckon that' ll break ' em before long.

Brandan