I gone through a bunch of Moto and Plantronic headsets and find the Motos have had better range.
From that alone I'd say grab some Motos. Problem being from what I've read the S9s don't work to well in a gym environment from sweat.
I have some HT820's and they work well, I sit the phone on a shelf about 15 feet away while working out.
I haven't done a range test of them with the Pre but with a MotoQ9c and a T-Pro I could get 75feet away with obsticals(sp?) before it started breaking up losing the signal completely a few paces more.
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