I love the look and have tried wearing them, but for me it just doesn't work, I have narrow sloping shoulders, which mean anything not securely done up or with a wide neck cnstantly slips off.
In addition I could never work out how to balance poncho and my big serviceable handbag, wear it under and the poncho gets in the way when you try to access the bag and you take on a most peculiar shape, where it over, it slips off and is difficult to grab as it slides down the sides of the poncho.