I have one in my possession right now. The install is a bit involved as you've seen from the instructions. A good father & son project if one/both of you is/are handy. It'll stop the rattle & popping out vent thingies as well as the dash warp/curl.
The cost is about $90 IIRC. I got mine for free from the dealer where I bought the car. Get a CEGer discount price from Signature Lincoln-Mercury.