I have both standard and Pro and if blind folded I wouldn't be able to tell which I'm using. The rotating head on the Pro Series seems to be less damaging to the end of the limb butt which is why I wanted to try them and I think they do a stellar job.
Then...recently my bow was mysteriously out of alignment which made no sense since I hadn't made any changes other than to unstring/string it. What I found is that one of the bottom washers had detached from the head and this changed the way the limb butt seated. Super Glue and Elmer's did not work for repairing it...sooooo, I tossed both washers.
However...the bottom of the floating head has a ridge around the outer edge that rims the washer. Sooooo, I filed/600 grit sanded them both until the bottoms were flat and smooth. The bow is now aligned and stable and just as quiet as it has always been.
Caveat: Without the teflon? washer, I would not try to adjust the tiller bolt strung.
ymmv
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