In the end, it' is the consumer who has to make the decision as to what they are or are not willing to do to get an increase in performance. Personally I don't care how it does it as long as it does it. But you can't lump ALL piggyback systems into the same catergory. Look at the BMS JB4 and Vishnu Procede V4/V5. Yes these systems are piggybacks, yes they have resistors and connections to various sensors that trick the ECU into seeing something other than what it really is seeing, but these systems also have integrated CANbus interfaces which is a game changer... These aren't your back in the day systems. Until you actually try one of these two piggyback systems, you can't really lump them all into one category.

I'm no expert, but this is similiar to what experience computer users / techies have been doing to their computers for years, OVERCLOCKING their CPU's. Intels new i3/i5/i7 processors have this new fangled turbo boost (overclocking essentially) already built into the chips. It's essentially the same thing as what these piggies are doing, they are OVERCLOCKING the ECU... Yes it will have negative affects over time, but it might take years before you will see any ill affects. (unless your stupid and you run 21psi of boost knowing you don't have upgraded turbo's to handle it, and various other supporting mods.)