That's true... but that's also more $ to get a whole new ECU and it's a LOT more dificult to reinstall the stock ECU than flip a switch and go back to stock specs. Good point though.
What about Dalhback

? It's become the new craze.
I've also heard good things about ProImports, that's probably where I'll get my Revo done (Revo cuz I'm an '03, and I LOVE that Audi still pays for EVERYTHING including brake pads, clutch plates, wiper blades, ALL maintainance, etc... I don't wanna ruin that

)... but hey, if you've got the hookup... then go for it.
Does GIAC do software only (port) tuning yet? or only hardware swaps still?