Definitely Easton A/C & X-Alum technology has the tightest spine tolerance from shaft to shaft and dozen to dozen.

As far as the all -carbons I' ve tested, Beman/Easton is probably best overall w/ Goldtip & CX about even among the major manufacturers. Carbon-tech has gained a rep for extreme spine consistency, but I' ve yet to test any.

As for the BlackHawk all carbon shafts...they didn' t last long enough for me to get them tested. IME, they are extremely fragile. My pro-shop has started carrying them (due to a pretty big price hike from Carbon Express creating a need for a low cost entry level carbon shaft in the shop) and I' ll be sure to keep tabs on what the customers think/find, but IMO they need drastic improvement: what good is the tolerance if the shafts cannot take even minor abuse? The dealer cost on them is so ridiculously low, there is no doubt they are having to sacrifice something.

The BlackHawk CAA (A/C/C knockoffs) are not bad however. They are not A/C/Cs but compare well w/ most of the high end all-carbon shafts such as Goldtip 3D Pros & CX 3D Selects.

Really..in an all carbon shaft, the Beman ICSH/Easton C2 line is hard to beat for the $.