i've given this much thought and here's what i figure:
its basically the bullitt suspension which is better than the old bullit suspension which is a proven system that works. for that alone it might be questionable. then ford throws in some pretty nice wheels, a 400 dollar gear option, and (the kicker) a sport mode like the GT's. then they give you good brake pads.
ford is offering the suspension i'd put in the car with some nice wheels, pads that i'd probably choose, and gears that i'd definitely order with the car for 2 grand ($1750 invoice) so i honestly can't think of a reason not to get it.
basically if i get that pack i only need to swap out that horrible base steering wheel, get a tuner, throw on an axel back, and the car is pretty much perfect.
ya just can't beat that with a stick.