The 5 star tuner's primary plus was resetting the shift points of the tranny which was known for downshifting from 5th to 1st or 2nd without trying to use 3rd or 4th. It would take the relative quiet cruise into a screaming V-10 without notice or reason.
I put the tuner to work and am really happy with the results addl HP "may" come with it but I never noticed it.
Don't know how the Ford people programmed the 6 speed but surely they must have fixed their shift pgm by now,