I've just purchased an Elegance and got the dealer to put on Michelin Primacy 3 ST. I've read lots of hyper-marketing on these, but the hook for me was the 'made for Australian/Asian roads'. The coarse chip roads here in Victoria are horrible for in-cabin noise and for someone who does 38K a year on highways, I'm willing to be swayed by the rhetoric.
I did a test run on a particular nasty section of road at 110k/hr and recorded the dBs with the demonstrator running on Continental Contact 2's. I got an average range of 80-82, which was better than my Octavia I was about to trade (81-84).
Now before I get into trouble with my methodology, please take these figures as amateur farting-about, not rigorous science. ;-)
With the new car in hand (PS, love it!) shod with the Michelins, dB was 79-81 on the coarse chip. Not a great difference but it was audible. I'm fairly confident though they did make a difference. Siri at least understands me now, as best as she can.
Furthermore, they are a reasonably comfortable tyre with softer sidewalks and I've yet to experience any grip issues.
Regardless, I'm a very happy member of the Superb owners group.
Cheers!