I just replaced the wiper blades on my M and they also made noise at first. Once they were used a few times (I guess you could say broken themselves in) they were quiet again.
2011 E92 ///M3 Alpine White / Black
2008 E93 335i Black Sapphire Metallic / Saddle Brown
1997 840Ci Jet Black / Black
2004 E46 ///M3 Laguna Seca Blue / Black