Everyone's perception and expectations of ride quality and noise/harshness are going to be different as sensitivities vary. Ride on the KW can also change dependent on damper compression/rebound settings.
Here are my thoughts on our F90. Have put just over 3200 miles on it now, mostly driven here in the Chicago area.
Stock EDC + OEM 19"
Comfortable, surprisingly compliant. No road noise or harshness over seams.
Stock EDC + OEM 20"
Still comfortable and compliant, some road noise, some harshness over seams.
KW V4 + OEM 20"
Lowered approx 1" front and rear, street alignment. More comfortable than stock EDC over bumps and seams without feeling floaty or bouncy. Sharper turn in and less body roll. Road noise stayed the same.
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