Infiniti has gone to great lengths refining many aspects of the M for 2011 but there are still many things that need improvement. While I enjoy my M56 a lot, there are features that worked better on my '08 M45 (such as XM NavTraffic, which is a disaster on the M56 and every other 2010+ Infiniti model). And there are features that are completely backwards, like the armrest button you press OUT to fold the side mirrors IN, and the song selection button you press UP to switch to the next song DOWN on the list. Doors lock automatically at 15mph and you can't do anything about it. And there is so little ability to customize the warning/intervention systems that one is inclined to leave them off!
Blind-Spot Warning/Intervention; no more legal challenge from the navigation system every time you turn on your car; gorgeous interior; more-powerful engine with better gas mileage than M45; Forest Air; ventilated front seats; comfy front seats with Deluxe Touring Package; Malbec Black exterior.
The Around-View Monitor found on the FX, EX, and QX is the most egregious omission from the M. (The BMW 550i has it!) There isn't any form of visual/audible distance warning for the front end and four corners, which is ridiculous. Also, add a Valet Mode, and enable Bluetooth Call Waiting/Caller ID.