From personal experience!
I have the ECU and TCU Unitronic Stage 1 tunes, and as mentioned in other threads, the most significant upgrade to my car was not even the extra 100 HP...it was the TCU tune.
I was always on edge driving the car due to the crappy gear timing, and going slow in traffic or the parking lot....holy crap Bucky. TCU fixed that believe it or not.
To put it mildy...VW screwed us big time with crappy econobox-esque transmission programming in this GTI. Look, if I wanted econobox programming I would have bought an econobox. The GTI and R are supposed to be (quasi) "sports cars" and I think should act like such. Not so with the factory programming.
Whats wrong?
The OEM DSG program ALWAYS wants to put the car in the highest gear possible and the lowest speed possible....you know, to save gas. 6th gear at 40MPH....are they kidding me!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!Total crap. We did not buy this car for it to behave this way.
I feel that I should not have to row the manual mode to get it to perform. Now, in D it works very very well, what a difference!
So, I fixed this situation with a TCU tune. I did not know what to expect, but the shitty way it drove off the lot, I knew I had to do something and the possibility was there to see if the TCU tune could.
It did.
Now, the car is ALWAYS in the right gear, slow or fast, tame or wild. No exceptions, its almost like it knows where it needs to be for the optimum drive-ability. I feel like I should send VW a F&*^#g bill for the upgrade seeing they could not give me this in the first place.
This car NEEDS a TCU upgrade to fix the shitty mess VW provided to us. And yes it is THAT GOOD. My advice for anyone who feels like the DSG is not working well for them, or you are longing for something better, or the Omni-present condition of it seems clunky (especially at parking lot speeds), get it fixed with a DSG tune.
I was of the mindset for $ 600.00 I was willing to try anything to fix this vehicular mess. It worked, and worked wonderfully to the point where the car is now a real joy to drive. Cant say enough good things about it.