I've got the Plantronics Discovery (although not with an 8700 as I haven't received my launch party device yet) and to date it has really worked well. As usual, some issues with ambient noise (when I'm on the rental car bus from the airport) but much better than others I have recently used Mot HS850, Jabra, etc.) Also MUCH louder than most others - the dreaded bluetooth volume issue with BB's.