I don't know, I always had a lot of problems with the SST Oryg (granted, I never tried the Odyssey Gyro or Gyro 2), but when I switched over the GTX-R, all my problems were gone.
But, anyway, I definitely agree on the Dragonfly upper cable (keep in mind that if the inner cable snaps, you can simply loop around a regular inner cable to replace it), especially with a Dia-Compe Tech 77 lever.