Sound of Door-Shutting
BMW did a study on the shutting of doors, and the sound they produce.
They found out that a potential sale was ringing if the buyer felt safe when shutting the door [solid feel and less vibration], plus reassured by the "thudd" sound and not "dooshd" or "thhhuud" sound (trying to get that right).
I love the shutting of the W126 door. Very precise "thudd" and once inside, the safeness can be felt all round. Much better than the W124 and W210.
I doubt if this is quality, but the current technology of closing doors?
126 tailed by a 203, 129 leading the pack.