I have them on my 73 Nishiki. They aren't the most visually appealing thing ever, but if you keep your brakes adjusted they will stop you just fine. I have had no problem bringing my 200 lb carcass and bike to a stop with them, but having said that there is no place for them on my Paramounts, at least the ones that use Weinmann brakes.
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1971 Paramount P-13 Chrome
1973 Paramount P-15 Opaque Blue
1974 Raleigh Professional Blue Mink
1991 Waterford Paramount
Holland Titanium Dura Ace Group
Holland Titanium Ultegra Triple Group