Plantronics Backbeat GO Bluetooth Stereo HeadsetProduct Review (submitted on December 4, 2012):
initially shy'd from purchase- due to price and battery life. bought the headphones to try them out, good sound quality but not used to earpiece style. the earpiece does block alot of the exterior noise but then you cant hear whats going on around you. I dont think they will work well for running or biking but are great for shutting out the rest of the world.