BM,

Their straightness and weight tolerance was very good but I had an issue with their durability. Now, I have shot quite a few different ICS carbons and at least one from every brand ended up bending on me when I removed them from a Mckenzie type target. When I say " bend" I mean that one of the inner layers of carbon ends up breaking thus giving the arrow less support and allowing it to bend even though there is no perceivable crack on the outside layers of carbon. The problem was that with the Blackhawks I had more of the individual shafts bending than I did any other brand.

Keep an eye on it. If you keep some slick lube or a bar of ivory soap handy then you may not have a problem.