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We bought this device to use in a small conference room in our 200+ man office. The conference room had no telephone line, so we would use the VoiceStation 500 via its Bluetooth connection to our mobile phones. It worked very well, and was obviously much better than the speakerphone of a BlackBerry. The conference room was 12x12', which is a little bigger than this Polycom could handle, so participants that were more than 4' away had to raise their voice a little to be easily heard on the other end.
I have also recently used it as a Google voice microphone+speaker combo via the aux audio port connected to my laptop. Again, it's a large improvement over wearing uncomfortable headset microphones.