I had full RX100 on an old DiamondBack steel frame years ago. As I recall, it worked quite well for quite a few number of years. It also looked very similar to 105 & ultegra -- minus the finish of course. Some would say with 105's matte silver and ultegra's dark gray (all circa early 1990's), the polished silver finish of RX100 was actually nicer looking. Performance wise, I felt that the gap between RX100 to 105 to Ultegra back then was narrower than Sora/Tiagra/105/Ultegra is today.

I digress. A worthy component group.