My conversion went well and works grandly. Opens up a whole new search for Campy brake levers.
Just remember, it's not just 10-sp. It will shift that interval all the way around the shifter boss. If I just had, say a 140 rear, I could get a bunch of 10-sp spacers and cogs, and maybe have a 2x15, downtube shifting, perfectly working..... Ha.
I think it's been asked before, but can the innards from those 10-sp shifters go into the Synchros?