I have a is220d se and in that i agree to the Crank when the heathers use to be on only, 6th gear was a waste, and mpg in winter time was poor, but so was my 320d m sport bkth giving 35 mpg,
But when i bought my is220d sport, it was suprisingly different, 6th wotks a treat on 70mph, and that crank aint there (could be cuz i have sat nav in this), but there slight noises from the cabin due to wear and tear but notjing noticable.. the only thing i can say is it does idle high, but again only with the heathers on whilst car is stationary.. I love my sport and much better than the se..
Oh one last thing, the clunk noise in lower gear changing does p me off, but that didnt happen in my se, maybe it was brand new.. And my sport is 4 yrs old now