I purchased this unit with my new Nokia through AT&T.  It functions as advertised and I would probably have rated it at least as average except for a most unforgivable feature.  The unit has a single rocker switch that is used for turning the unit off, accepting or canceling a call, and redialing the last number called.  So I have TOO MANY times actually redialed the last number when I thought I was turning it off.  I am sure I could receive electroshock therapy to correctly learn the right method, but it is not intuitive.  I use the phone for business so I cannot risk annoying a customer or vendor with this idiosyncrasy.