Purchased the M45 after owning a BMW 525, then a 2000 740IL. The Tech package of the M is awesome. Love the 3D GPS, voice activated controls, rear backup camera, A/C control seats (could be better), and overall looks. But from the very first oil change, have noticed using oil; not leaking, not smoking, but I have added from 1 to 2 quarts between changes. Also, moonroof leaks in any car wash, have had to have the AC serviced each year. Heated and cooled seats do not compare to the BMW. Ride is noisy, low-profile tires look great, but makes bumpy ride. If battery dies, no way to open the trunk (for jumper cables).
3D GPS, voice activated controls, sound system, looks, dash lightings, entire tech package, keyless usage, great paint job
Expand 16 gal tank (could reduce size of trunk for bigger gas tank), gas mileage, auto trunk lid open, key access to the trunk for emergencies.