As with all chip tuning, be aware of 2 main considerations1 You will need to tell your insurance company that your car has been modified, which may result in increased insurance premium2 You will most likely invalidate the warranty on the car
I think it's a little bit old topic but I'd like to point something important. Web site says that with the box, your car will have maximum amount of torque. Your S-Tronic transmission can handle 600 Nm of torque but it is not recommended that pushing the car to the limits. When you use this box,if your car is 177 HP quattroyou will gain nearly 532 Nm of torque (%40 more torque they say). I bet on that this cause most likely transmission problems in future.
Instead of ready to use boxex, I strongly recommend MTM, Evotech or ABT ecu tunings for your car. Those softwares are desinged especially for your car and trusted manifacturers do so many tests on it before they launch the software.
But I also agree with rontheman about the warranty.