I have xplan throught my employer but the last wo fords i bought (08 and 10) both here cheaper old school negotiating. Keep in mind that one of the xplan requirements is it is non-negotiable pricing so if you elect to use it let them know when you walk in and know you will not be able to negotiate at all. Just keep an eye out that they dont add anything in ford pays them a processing fee they are not supposed to add to the xplan price other than government mandated tax title etc
Now I'm not trying to be a smart *** nor do I question anyone's integrity but how can just getting a number from a Ford forum or by joining some organization can you get a better price on a new Ford vehicle?
You could do better with old school hagglling as someone mentioned, but only on a truck that isn't in demand. If they have several of the same/similiar trucks around then you might beat the xplan.
Thing about the xplan is that you get the rebates too. So for instance if you are looking at a truck with msrp 50k, the xplan price coule be 47, and then you would take off the current rebates of 2k. So price would be 45k.
Also, in my opinion, if you are thinking about ordering one, xplan and rebates is definitely the way to go.