Too quiet / mute switch hard to use
This Plantronics M214C headset is one of the few items I've ever returned to amazon, its that bad. With the volume cranked all the way, this headset was still too quiet to hear the other party. Also, one of its big features turned out to be a dud - the mute switch! Its very hard to slide, requiring two hands - one to hold the controller, the other to slide the switch. Makes it impossible to pop in and out of a conference call quickly by toggling the mute switch. I ended up getting aPanasonic KX-TCA60headset instead and its FAR louder. I don't miss the lack of volume or mute controls on thePanasonic KX-TCA60as those buttons are on the handset.