I ride RX-100 hubs every day on my Bridgestone RB-2 -- though the Bridgestone catalog for 1991 says my bike came stock with Shimano Exage hubs. My bike came original with a 7-spd cassette on the rx-100 freehub.

My bike is a mix of Exage (derailluers) and RX-100. I find these components to be top-notch, I view them more on the level of modern day 105, which I have also used.

Bridgestone spec'd their legendary RB-1 for 1991 with RX-100 hubs, so I would think these hubs were perceived as being of high quality.