I just installed a set of Michelin Pilot Sport A/S tires with 245/40ZR18 fronts and 275/35ZR18 rears on AMG 18x8 and 18x9 Aero II Monoblocks on my 560SEC.

So far, excellent! Quiet, great in the rain, and well....seem to be holding up fine. Granted, I only have 4000 miles on them. Time will tell...