Do to limited options through my local installers, I am reluctantly putting a second set of these OE tires on my GLK. 32,000 miles is not completely unacceptable as I consider myself a hard driver, but at a premium price, this tire isn't really worth it. A 235/50 R19 is a farely odd size tire, and if I could find them I'd be going with Bridgestone Dueler H/Ls at 2/3 the price.
I can't complain about the traction or ride so far. In dry conditions, even now with wear bars close to showing, it's pretty quiet and still corners well, but it is July and that's not the true test of a tire in the Northeast. During my first winter, these tires performed exceptionally well, although it could have a lot to do with the MB's 4-matic system which i have had on 4 cars now and swear by. But like many reviewers, I did notice a sharp decline in traction during this past winter in which the tread was probably about half worn.
At 32,000 I could probably squeeze another late summer/fall out of them except for the 2 small nails and a cut in one of the treads due to the incessant road construction near my home for the past year. Since I return the car in 6 months, I'm willing to forego the lack of treadware and hope this new set performs as well as my last ones did when they were new. Then pass the headache back to the dealer that gave it to me. But based on value, they would never be my first choice.