I just put DWS on my 20". Only had short drive, but no vibration to 65 mph. No funny noise, actually quieter than my Mich All Season HP 19". I have to drive it more to confirm but the ride actually feels smoother with 20" & DWS than 19" & Mich HP.

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2011 X3 35i
2008 X5 4.8i
2003 330xi -sold-
2001 X5 4.4i -sold-
2001 M5 -sold-
2001 M Roadster (SCed, Highly modified) -sold-
2000 M Roadster -sold-
1995 325is -sold-