I have the same Continentals on my ride...and the noise gets irritating at times. However, i think much of the noise (or lack thereof) really depends on the surface composition you're driving on.
I noticed a substantially quieter ride when i'm driving at highway speeds over asphalt versus when the road material is more concrete in nature.
In the latter scenario...the noise coming through the cabin is reminiscent of the sound a rubber kick ball makes when kicked (that "boooinng" sound) but just never ending...a hollow, rubber ball sound...which i suppose...is exactly what those tires are
The other drawback for me is that these are summer tires...and given that i live in a very mild climate (Los Angeles) buying a set of winter tires makes zero sense for me. However, with these summers...i unfortunately really can't take this car up to the snow...so we'll still likely drive up (once a year) in my 2013 328