There is noise when a call is stablished Volume control not stable (goes from high to higher by itself) Should have an option to connect a headset if needed.

Portability; Price

Lack of jack for headset; Noise on stablished calls

Speaker is such good quality, both speaking into and hearing as a loud speaker conference room style.....The microphone annoys me,...if you don't constantly put it on mute, it reverberates loud and crazy....I love it........The 510 I bought was refurbished, cheap like $75 vs $150 new.......

It was easy to setup, with a company locked down Windows 10 client. I use with both WebEx and Cisco Softphone over wi-fi and fibre home broadband. The sound quality is excellent in terms of both hearing other participants in a call, but also verified that people can hear me without any issues - eg...

What an excellent purchase. I could not be more pleased with the simplicity and functionality of this product. Sound clarity both as a mike and speaker is excellent. Portability is great. All good with this.

Works well as a conference room speaker/phone. Not quite as good as some of the reviews have claimed but useful for Skype and better the in-built speaker and mic on the laptop alone. Good value for money compared with more specialist conferencing equipment.

Very good product, reached on time, meets the expectation as mentioned. 100% Satisfied.

Great little speakerphone. Just plug it in and it works. Much better audio quality than the built in mic and speakers in my macbook.

very good for conference calls over voip.

Good service

Does everything it says, and more. It's a powerhouse in a small and very portable compact size. A no-brainer to install ... just plug in the USB cable that stores by wrapping around it, and you're good to go. All device drivers install automagically, and the Lync-optimized features are active.