For me it's the huge added complexity for no HUGE benefit.
Get a chip and the car runs as it would as standard in all conditions (cold starts, hot starts, hot temps, aircon etc etc), a piggyback ecu has to be tuned for all this.
Id rather someone elses car(s) do thousands of hours on the dynos and in all conditions rather than my car sitting on the dyno for a few hours.
I'm yet to see a car with minor mods and a piggyback ecu make more power than a chipped car with the same mods. (On an independent/same dyno - No point using the tuners dyno figures)
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