Both, and going off customers at work who we have sold them to , they seem very happy . Our vans have them or Hankooks and they out last them . Will look into the mileage thing today and get an avarage for you. But I have done 4k in mine and they still look new.
I've used Nexen no problem good tyres good grip and wear well. I'm currently trying a set of nankang NS2 on the CLK as we had good experience with them on the Subaru and so far brilliant, great grip, hard wearing every bit as good as the falkens they replaced for about 60% of the cost, would not hesitate to shod any of my cars with Nexen or Nankang. Tyre technology with these company's tends to be about one step behind in terms of compounds so the premium brand today will be the budget brand of tomorrow.