My SunTour Cyclone II is my favorite rear derailleur by far. I graces my lowly UO-8, which was bought as a bare frame and has had nothing both SunTour rear derailleurs (V-GT for wide-range gearing for my wife, then V for me, then Cyclone when I pulled it off the PKN-10. (I put the original Simplex back on the PKN-10 when I gave it to our son. Bikes and bike components circulate around the family sometimes.)
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"Far and away the best prize that life offers is the chance to work hard at work worth doing." --Theodore Roosevelt
Capo: 1959 Modell Campagnolo, S/N 40324; 1960 Sieger (2), S/N 42624, 42597
Carlton: 1962 Franco Suisse, S/N K7911
Peugeot: 1970 UO-8, S/N 0010468
Bianchi: 1982 Campione d'Italia, S/N 1.M9914
Schwinn: 1988 Project KOM-10, S/N F804069