ECTurboGSX

I've been reading through various ECU and "chip" threads on here and on Club202. From what I have gathered, it looks like the companies aren't selling a chip, but just reflashing the software in the ECU. Anyone know what type of software they are using? Also, has anyone used any type of piggyback controller to modify the MAF and timing signal on the dyno to find your own gains? Sorry, I'm just coming from doing that type of thing myself and there seems to be a lot of mystery wrapped around doing it on the Benzos.