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
Previous BMWs - 2012 135i MSport 6MT Jet Black(sold), 2012 135i MSport LMB DCT(sold), 2011 X3 35i MSport VR (sold), 2009 M3 Sedan AW (sold), 2008 535xi MSport AW (sold), 2007 328xiT Barbera (sold), plus 11 others in the 70s & 80s.