ARed, Nothing wrong with the RSX group except it's heavier than those higher up the food chain. Otherwise very comparable in operation to the RX100 and 105 groups of the period. Like the Sora group of modern times there was a unique aspect to RSX and that was the chainring sizing at 38-48 for the double, unusual at the time.

As the RX100 group was identical to the 105 group except for color, I suspect that the RSX evolved into the Tiagra and the thumb shifting Sora added. As it is, if you're looking for prestige you need to look elsewhere.

Brad