I still put a thousand miles or so a year on my '73 Raliegh Competition, purchased new in 1974. Regina Oro was definitely a step up from the stock Atom, but the IRD 13-28 coupled with a SRAM 8 speed chain is an order of magnitude better than the Regina. The shifting ramps on the IRD work great with my stock Huret Jubilee derailleurs. No more over-shifting, then trimming back now as the ramps on the IRD initiate the downshift earlier. It was also nice to bump up my top gear to 52/13, where as before I was limited to 52/14. Oh, and even though it's a true thread-on freewheel, it is easily removed with a standard splined Shimano cassette removal too.

Two thumbs up for the IRD!