I have both tune the ecu and the tcu tune and they work great for me with no issues for 3 years now I feel it increased power, smoothed out power delivery, and made the shifting match the tune.
Question about the TCU Tune;
If you are in manual mode and floor the Accelerator does the trans kick down?
2008 A4 2.0TQ Quartz Grey Metallic S-Line/Titanium Package
2017 A4 2.0TQ Glacier White Metallic Prestige Sport
2003 RS6 TOTALED.-----Searching for a replacement