They are exceptionally crappy. I bought a set about 4 years ago, they went out of balance about 4 times in the first 12-13k or so.....then they could not get them to re-balance....something was wrong. So I claimed warranty and got a pro-rated replacement with the Michelin Destiny/Harmony tires.....they have lasted forever, I've probably put close to 50k on them so far and still have nearly 50% tread left! And they are smooooth. My dad runs them also on one of his SD's and after 5 years they are still doing great.
Moral of the story, don't buy Goodyear Assurance TripleTred!
Another tire I recommend is the General Tire Altimax HP.....I put a set of those on my W124/300E.....and they are an awesome tire considering they're about $65 apiece. Smooth, quiet, great traction in the rain and snow.
And, they have a really nifty tread look to them.
http://www.generaltire.com/tires/T2/AltiMAX-HP
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-diesel is not just a fuel, its a way of life-
'15 GLK250 Bluetec 118k - mine - (OC-123,800)
'17 Metris(VITO!) - 37k - wifes (OC-41k)
'09 Sprinter 3500 Winnebago View - 62k (OC - 67k)
'13 ML350 Bluetec - 95k - dad's (OC-98k)
'01 SL500 - 103k(km) - dad's (OC-110,000km)
'16 E400 4matic Sedan - 148k - Brothers (OC-155k)