I use BlueFusion in my 04. I love it. All bluetooth integration, allows me to use the steering wheel controls to answer the phone, hang up the phone, go thru my phone directory, change the track I am listening to, etc. And it allows me to connect my phone, or if I want to use my wifes, it pairs right up, and all is done. Of course this only works on the 04+ models. But I have already bought a second unit, and plan on installing it in my wifes Aztek when I install the Rendezvous navigation system.
The downside is that it doesnt charge the phone. But with a USB plug mounted under my center console, I just charge it when needed. Hardwired is good for charging, while doing the rest.
But, when you are a commuter, the plugs do tend to wear out, both on the phone side, and the hardwired side, from all the daily plugging in and unplugging. So there is a wear factor involved. Where as with the bluetooth, you dont have to worry about wires for your commute to work, or home. Just hop in and go.