you will probably want the flash adapter model so you can do a bunch of vehicles if you so desire. You can program any ford vehicle 96 and up with that hardware.... not just expeditions. The package comes with the special forces software and flash programmer. You pull the stock file from the truck, change it with the software (the flash adapter plugs into the computer with USB) then you write the file back to the flash adapter then you can flash it back to the truck. You can always put the stock file back if you so desire and you can save the files on your computer in case someone ever steals your flash adapter.
Call those guys, they are very helpful. Chris or Pat Stadjel will probably answer the phone. These guys have been behind the scenes at all the other tuning companies (diablosport, superchips, hypertech) for years and have only recently been doing this on their own.
Matt