After looking at their website, it appears the DMS flash doesn't appear to make anymore HP's than the other tunes available. Although having the ability easily flash the ecu through the OBDII sure would be convenient.
I would also be curious to know what parameters the tune manipulates e.g. timing, fuel delivery, boost etc and how does it increase fuel delivery e.g. increase fuel pressure or injection timing? Can you find out from DMS? That being said,