With this thread I would like to collect comments on the degree to which the PS 85 could cause arm problems. Personally the PS 85 fascinates me because of its headsize, weight, string pattern which are similar to my current main stick, Wilson Reflex midsize. But what has always frightened me are certain other specs of the frame, more specifically the composition: graphite is fine, but KEVLAR??? And the rigidity: 66. Now I have been thinking that might be exagerated. Many reputedly arm friendly racquets also contain percentages of Kevlar, e.g. Volkl C10 Pro. Infact there is Kevlar in the PC 600 too, only under the name of Twaron, which is exactly the same thing. So, please tell me about your experiences. Has any of the PS 85 users developed tennis elbow problems with this stick?