Hello Tobias!
Two years ago, I had a chip installed in my Golf IV 115PS TDI PD by ***. It was very affordable at the time because they were having a 'special offer week.' I paid DM 1200, including the TÜV registration!
The difference from the standard version was not insignificant. The driving pleasure was even better than before

.
BUT:
Die Kupplung machte leider durch die, beim Beschleunigen von unten raus, schnell ansteigende Drehmomentkurve etwas Probleme. Die Schlüpfte hin und wieder im Bereich von 1800-2000 U/min. Es trat erst am ca. 50.000 km (davon 20.000 mit Chip) auf. Es war, wenn man bisschen aufpasste kein größeres Problem, die Drehzahl machte nur hin und wieder einen kleinen Satz um ca. 200 U/min nach oben und fing sich sofort wieder. Ob es schlimmer geworden ist, kann ich nicht sagen, da ich den Wagen inzwischen verkauft habe.
However, I had previously inquired with Sachs. They told me that it was possible to obtain a kind of 'reinforced' clutch from them.
CONCLUSION: I would definitely go to *** again. The service was okay! The work was completed in a few hours. During that time, you can easily take the bus to the beautiful city center of Kempten

.
I hope I was able to help you a little bit...
Feel free to post your questions or email me directly.
Best regards from Lake Constance.
DENNIS
Hello everyone,
Has anyone here had any experience with chip tuning from *** in Kempten?
Or perhaps with other chip tuners? (********, ***, Oberscheider, etc.)
I would be very interested.
Thank you for your posts.
Greetings from Lake Constance.