The way they shoot with open blade broadheads is basically what I am referring to. The difference is not between .006 or .001 in advertised straightness. It is between which of the dozen is as straight as it's claimed to be and which ones are out by much more. I've shot arrows where maybe 5 of the dozen would really group right with broadheads (out to 40 yards) and for some reason that bothered me a bit. The Carbon Techs I shoot now are all good with broadheads, and they are only advertised at .005.