Knowing the shaft profile as scotts33 and golfnut2400, Dyno, etc have posted is the most important piece.of info other then getting the weight right. I know some will suggest a high dollar shaft will perform better then an inexpensive shaft that profiles the same. Better feel, more exotic materials, blah blah, while some of that may be true, most of it is pure marketing bs.
Give me a Wishon s2s Black 65, 85 and it'll perform as good as the NV, rogue silver, 6m3, etc.