I live in New England where the roads are HORRIBLE. I have not for a moment regretted getting the SP. The ride in my brother in law's Murano is significantly HARSHER than my sport package, to the extent that the back wheels actually BANG over medium sized bumps..

__________________
2006 X3 Sport (everyday)
2005 Porsche Boxster (weekends/stress relief)
2005 Acura MDX (hers)