I rode my ItalVega today. It has a Nuovo Record rear derailleur. The rest of the drivetrain is right in its wheelhouse (24T big cog, probably a SunTour freewheel and a SRAM 8sp chain). It shifts perfectly. I suspect others have mentioned this or at least alluded to it, but if you keep this derailleur within its design specs, it's fine. If you get out beyond its limits - too many cogs, too large a big cog, long pulley cage - you're likely to have trouble.