Met my expectations
1 year after buying it with a 60% discount, I'm not sorry I jumped at the chance.
I use it mainly for videoconferencing, so it's not as useful as it could be.
It replaces the removable microphone on my headset.
I plug it in via USB to my MSI laptop running Ubuntu 16.04 then 18.04.
It makes the use of an external sound card totally unnecessary.
The microphone volume is set entirely in the computer's sound configuration.
Its headphone socket lets me plug in my headphones.
Its volume knob lets me adjust the listening volume.
I don't need it, because my headphones have a volume control, in addition to the other two software settings.