I do not know much about it. I researched the same thing last year while shopping for my Edge and I remember a thread on this forum about it. I do know it is not cheap and lots of wires. If it were me, I would buy a cordless bluetooth speakerphone unit that hangs on the visor. You recharge it like a cell phone and you do not have to tear apart your truck to put it in. One push answers the phone. There are tons of brands, you can get a really good one for around $100.00. Consumer reports and reviews on retail sites would be a great way to find the best one. Amazon.com would be a good source.
http://www.amazon.com/Jabra-Cruiser-Bluetooth-Car-Speakerphone/dp/B002PY7P2U/ref=sr_1_3?ie=UTF8&s=wireless&qid=1271272441&sr=1-3
Here is an example of a speakerphone. I love Jabra products. I recently got a Jabra Stone ear bluetooth, great sound.