Just picked up my 2013 335 M Sport on Saturday, the car had about 100 miles on it when I took delivery (was not expecting dealer to get me out of my e92 335 lease early). Anyway, after some light driving I'm experiencing the same brake squeal as others have reported. My car sounds like a city bus when I pull up to a traffic light.
I'm pretty tight with my SA so I will provide any feedback I can.