Mine Works Fine
I ordered mine in January and got it a couple of weeks later. I live in the Chicagoland area and it seems serviceable. I do wish the lights on the side of it were more obvious.
It's on an iPod Touch 4, combined with Talkatone and Google Voice to basically give me a nearly free cell phone. Happily, the whole shebang can also connect to the Entune in my Toyota, so I can even make hands-free calls with it.