Sold my low mile 95 M3 and kept old Porsche SC Cabiolet. Bought used 540i thinking comfort but did not expect comfort and FUN. Corrected usual bugs in cooling system for peace of mind. Great acceleration, not as quick as M3 but easier on these old bones. As fast as P-car but not through corners. Don't understand knock on stereo as premium unit is terrific once you read directions. Added homelink via ebay (very simple install). Will buy another when - and if - I wear this one out. Rock solid at > 100 mph (so wife tells me).
Performance in a 3800lb 4 door sedan. Wonderful touring car. Acceptable mpg for the beast that it is. Great seats. Heated seats are better than those in M3. Safety in mutliple air bag system. Over 60000 miles and tight. Makes it tough choice to take old Porsche out for a spin.
Cup holders are designed for aluminum cans, are fragile and silly... no, make that just plain stupid.