That's good to hear, but it's kind of sad that you and the dealership have to go through that much trouble to fix something so basic. It's 2011. You kind of expect a car, even a $12,000 Hyundai, to accelerate smoothly when you step on the gas.
Hopefully, it's not just a temporary fix. Let us know if the problem comes back.
1999 Z3 Coupe
2011 328i Convert
2012 E550 4Matic