Most complaints on sport seats come from ppl who are "on the heavy side". I have had the sport seats in my last several BMWs and they have been excellant. I don't see how you can wrong with the sport seats (unless you are obese).
2012 328iTouring xDrive Black Sapphire
Waiting for: 2016 340i xDrive MPerf. EBII
Previous BMWs - 17 others since 1971.