No regrets, quite the opposite – my Octavia 1.4 TSI combined with the P-Tronic tuning box is far better than I expected. It works great at all engine speeds! The smoothness is surprising (torque from 1400 rpm), giving the enjoyable sensation of pushing pleasantly firmly all the time with no suddenness. Simple to fit. Just follow the instructions (colour manual in several languages). I contacted them twice. I talked to Michel, who was very responsive.
Carlo (Florence, Italy)