Never tried Superb derailleurs, but as to the rest of it, the crank especially, nothing was superior to Campy Super Record. This is one of those bikes from the mid 80's or after when more and more people simply couldn't afford the full Campy routine as it got up towards $1500 for the bikes. The Japanese stuff was getting very good and people switched over because it was also slightly cheaper. I'm sure it works as well, but servicing a campy bike with Campy tools was a Zen all it's own, and I don't think any other bikes could be overhauled as quickly after a sloppy race or stage. And I started to feel after working in my share of bike shops through the 70's and early 80's that I was glad I was finally out, because things were getting diverse and more exotic, and more and more special tools seemed required.