I been stung by them, took a car in running a GGR stage 1 chip at 277.7bhp 268.2lbft.
After EA's stage 3 chip it ran 328.8bhp 288.7lbft, but also 10.5 AFR.
Was not happy, went to 1st place I went to for a power run(£20), where on the same rollers as the GGR power it was revealed to be a true 271.5bhp 334.3lbft, but with 9psi more boost, so immediately changed back to GGR chip, could defo notice the torque difference, but twice as good on mpg!!
What I liked about it was they use a rolling road that isn't dyno dynamics!!
Now on aftermarket so don't need to worry.
STEER CLEAR IS MY ONLY ADVICE
tabetha