from a friend of mine he just has the computer on with lid closed and records the ride and then makes adjustments and rides again. it will store your ride for review. that is with sert. as for xp on a mac, if you have 10.5 you can use bootcamp and install xp and drivers and the mac will work like a pc. my friends 06 screamin eagle was adjusted using the pinion seat as a place to hold the computer. from the screen shots i have seen it looks like audio analyzer and you can see drop in HP at rpm.
https://www.hdforums.com/forum/engin...hat-is-it.html
https://www.hdforums.com/forum/elect...aster-diy.html

 

the download always sounded like a gimmick to me. if it was that important, make it standard. its just a computer mapping.