no, squeals are problems. Even on the best brakes in the world, Ihave had two GT3s and
they both had the ceramic brakes and those guys had times where they were super noisy coming to stops. That was aggravating on one of the best performing cars in the world.

I dont even worry so much about performance because I dont track my BMWs but When I was deciding to buy an M3 or a AMG C63, the last point came down to the poorly unfinished single pots vs the Huge Silver 6 piston Painted amg Brakes on the AMG. It just finishes the look of a high performance car. When some one walks up to me about one of my AMGs or Porsches one of the FIRST thing someone says is WOW look at those brakes!
No matter what direction you come at the car from the person walks around to the side and thats the first thing someone says. BMW is the ONLY company to leave the look of the brakes to the unwashed. But on the M3 in 09 I think they addressed that now. I just wish the whole line did that. I dont know what other models have brembo like Brakes.

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2011 X5M
2006 X5 4.8is
2009 Porsche 911 PDK