I never used the simplex ones. I have used and love the Campi Doppler (retrofriction) and they are great. I also have this odd pair of Sachs ratchet shifters that are pretty cool but unfortunatly a cable end is stuck inone of them.
here is a pair of simplex NOS but they are already $65
http://cgi.ebay.com/Simplex-downtube...item3a572572eb
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“One morning you wake up, the girl is gone, the bikes are gone, all that's left behind is a pair of old tires and a tube of tubular glue, all squeezed out"
Sugar "Kane" Kowalczyk