So iv had a kerma tdi tune for about a month now, put on 4,500 miles and figured it was time to tell people about it. Install was super easy, Install the software on your computer, Plug it in the obd2 port, copy the factory file, email your stock file, wait for a email back, plug it in your car and your set. The car drives great power has gone up, Drivability is improved and the car pulls like a freight train. I am getting 42mpg's with city driving and on the highway i am getting 64mpg cruising at 70mph. I wasn't sure about buying a tune until after the dust from diesel gate settled but I said screw it and have not regretted it. 10/10 would recommend.