I got the Tatrix II cable and have been working with a tuner to help solve some issues. We are on rom v13 at the moment.
It is definitely interesting, but we have made no progress on the issues that I have. He's still adamant that there is something mechanical wrong with the car, because it is pinging badly. So we are in the process of eliminating possible causes.
The tune he uses makes the accelerator very aggressive and does make the car seem more alive with minimal throttle input, but I have seen very little overall gains in performance. Also the pinging has been tuned out.
I just find that whatever you do, you are fighting the gearbox all the way. It just does not want to work with the car in normal mode. Sport mode suits it better but I still think the gearing on it should have been changed to better suit the weight of the car and the high revving nature of the engine.
However, I will wait until we find the reason why she is pinging so badly, until I give my final verdict on whether tuning (for performance) is worth while on the B9.