Simply put the Sprintbooster just changes the response curve of the drive-by-wire throttle, it doesn't do anything as far as your DME engine mapping programming is concerned.
Shark software makes changes in your DME software programming, among them it changes the drive-by-wire response curve. It would seem to me to be redundant to have both which is probably why he was selling the SB.
Sprintbooster IMO is alot of money for what it does. If you want faster throttle response just press the throttle faster.
O
HTH....Barry