Well.. even after reading the car and driver article, I still decided to go forth with the software upgrade. I have to admit I was very skeptical at first.. but after I drove the car, I felt a difference. I felt more torque as I approached the 3000-3500 rpm range. On the highway, I shifted from S4 to S3 and did a lane change.. because the rpm went way up.. I was able to move up the next lane very quickly. Going up hills.. I notice a lot more power as well. Overall.. I'm happy with the $335 I paid for the Dinan software upgrade.