I've never experienced that at all. I had them on my 2001 X5 for 3 years before I sold it (with those tires) and never had an issue. I had them on my 2004 X5 with 18" rims for 3 years (before I upgraded to 19" rims with Bridgestone Dueler H/P Sport tires). They were always smooth and quiet, they wore really well, I liked the handling over the Michelin Energy tires that came initially on the car.

FWIW: We went to Bridgestone's on our past two 3 series cars to get away from Pirelli and Conti's which wore poorly and got progressively louder as they got more miles on them.

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2007 328i Sport, Monaco Blue
2011 X35D - sold -Space Grey
2004 X5 4.4i - sold - Kalahari Beige
2001 X5 3.0i - sold - Pearl Beige
2006 325i Sport, Sonora Beige
2000 323i - sold - Sienna Red