I've run an E60 535d for four years, now on an F10 535d.
If you've only driven a 530d, then you would wonder why bother with a 535d; but once you've tried a 535d, you wouldn't want to go back.
The two things that really set the 535d are instantaneous throttle response - there is no lag whatsoever, it is sharper than even a 550i - and the ingear acceleration between 30 through to 70 - passing slow moving traffic becomes so easy.
The price difference isn't quite as large as it seems, as the 535d has the auto as standard.
F10 535d mSport Oct10:HUD,Act.Cruise,Adapt.Drive,Srnd View,Night Vis,Lane Change,Rear/Side blinds,Folding rear seats,Prof Nav,Prof Spkrs,Comf.Seats,Sports Auto,Speed Lim. displ,4zone climate