Excellent piece of kit for near noise free hands free talkin
This really is simple and safe to use, hooks up to my sony w880i with no problem, and works a treat with voice dialing. Very clear audio and everyone I've spoken to has said they can hear me fine when I'm using it.
It's a very tidy little package and feels reasonably robust. You press the call button once to activate voice-dial and the power button once quickly to end a call. Very simple. It can do call switching and stuff but I haven't tried. The sun-visor clip is fine and works best without the swivel attachment.