Just rolled over about 800 miles on the new MXM4s. Wow! So far very impressed. The ride was incredibly softer and quieter. I kicked up the width just a little bit to 215 instead of the stnd 205 (on 16's). Keep in mind, i was running absolute junk before the change.... The PO put on GY BlueStreaks which were very old, extremely harsh and loud.
For about the first 200 miles I noticed a pretty good vibration coming form the front of the car.... this has since passed. I wonder if this is some sort of breaking in period? The car rides like a dream now and I would recommend the tires for anybody who is looking for a 55000+ tire.