Hello... I'm considering putting a bid on this rare but potentially nice Superbe RD for a backup to my Cyclone GT or for a future project. I can't help but think that I might be better off with a new Shimano 105 or Ultegra to handle my (touring triple) 6 speed friction shifting needs. Cheap compared to some of the frenzy type vintage bidding on Ebay. The price you pay for trying to be period correct. Anyone have any first hand experience with this derailleur?