Not 100% convinced
If the need for another, indeed any, live mic as a way to control a computer. I look forward to the day when someone asking 'what's the weather, computer?' will be told 'open the bloody curtains and look outside, you moron!'.
I have colleagues, and they seem on the whole sane and balanced people, who swear by these things - to the extent of having multiple instances in the same room 'for stereo' - so there must be something in it... but I fear I am not the target audience.