The tyres surprised me, considering the amount of bad reviews for the MC5, the MC6 is a totally different animal. I've driven the PSS and this comes close to it's dry grip performance.

These tyres are just brilliant and changed my car for the better

A set of F/R 215-50+225-50 (17") (Maley made) on Mercedes Benz W124 E500 - Jan'18
Review at range 1,6xx KM. in Thailand, Mostly on motorway (80%) and B road (20%)
PRO :
Dry grip are great, a bit better from MC5, and super stable on upper to high speed drive, confident on control. worm up supper quick, break on dry are super, real life compare with another e500, fresh new tyre both, MC6 is abt 1.5 s. quicker and 21-22 m. shorter to stop compare with the Thai's made - Primacy 3-ST on the same size.
CON :
A bit down breaking in wet (rainstorm wet, from 110 Kph to 40) its better to keep more distance as I felt the tyre are skid on the water time to time, and....a massive down on noice, this new one is, still, so loud on higher speed, a bit quieter if stay below speed limit. and the wear, I did 23,xxx km. in 17 months on last set of MC5, and its was totally wreck at that point, so far, it seem like long lasting wasn't the major improvement on the MC6.

SUM : One of the best tyre on dry, high speed and performance user, compare to the price, this is still be no.1 as of early 2018. hopefully won't see defect on sidewall or structure damage like other model from my pass on this model, So far, So good.