if thats the TT setup you're talking about, then its really more for show and the ability to say that your car is twin turbo than huge performance. Not to say that it's not good for performance, but it's a bit of a waste of money compared to your typical stage 3 kit.
I guess the only good thing would be that the smaller turbo's should spool up faster. I emailed forced air tech. and they said the HP gains are the same as the stage 2 kit so I think you're right, more show than go.