Cool. Essentially removes the 7-second limit for overboost, so perhaps slightly less bang for the buck on "is" engines. But still cool.
Being that the N54 engines are all the same, the power output will also be the same for each of the Dinan Performance Software stages if it's an "is" model or not. However Dinan's Performance Software gives the "is" more reliable power and not just in 7 second increments but as long as you keep your foot down.