This model uses three microphones (one in each corner of the triangle), all of which remain active the entire time. Depending on your room acoustics and where you sit/stand, you may sound like you are talking from inside of a deep well (kind of a hollow echo). Better Polycom models (like the Soundstation Premier) avoid this by only leaving one microphone active at a time, and with higher quality components and circuits. For example, noice canceling circuit to to remove background noise, a feature lacking in this model.

That said, you may still be happy with this model, as it costs a whole lot less than the Premier version and is way better than the built-in speakerphones included in many desktop handset units. To decide you need to consider how important the quality of your conference calls is, and what kinds of acoustics the room that you'll be using has. If you need the best, go with the Premier, otherwise this is a solid model.