We have 4 brand new Nokian RSI-their very latest dedicated snows, on our wagon, and older, out-of-production Hakka 1's on the BMW. Both are pretty amazing, and even dry road handling is not that bad, considering. I am a convert.

I have heard that the WS-50s, while quite good for snow, are just plain bad for dry road handling and not recommended for MBs of any kind; very squirley in the dry. I am pretty sure Tirerack Luke at the wheel and tire forum confirmed this at some point.

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1995 MB E320 Wagon
2001 BMW 530i
2007 MINI Cooper S (!)