If rpm is 6500 or under I would use the comps. The 8620 steel they are made of is tougher than an anvil in the desert, but they're heavy and I don't believe comps 'over the nose" claims about the weight. Mass is mass and it has to accelerate and decelerate in a controlled manner. Higher rpm and I would use something else like the Hughes. I personally don't trust needle brgs not to break,but that's just my