The range is good on the s9hd, but I. Noticed after playing for a long time it will stop playing through headset and play through phone. Bothphone and headset bluetooth are on. I have to go in to setting and disconnect and reconnect....also not the most comfortable set. But for the most part it works
this also happens with the s305s, approximately once per charge (once per 4 hrs or so, for me)
not sure if it interrupts because i'm losing 3g signal for a second, or what. it does happen though.
that being said, i don't think this is a probblem with all bluetooth headsets, as my jawbone icon seems to never lose a connection, except when out of range