I've had a pair of EOS 600s (the European designation of the same camera) and an RT for over 20 years. Apart from a noisy wind-on motor, nice cameras. It was the first EOS camera with predictive autofocus for moving subjects.
The 600/630 had interchangeable focusing screens, a selection of alternative backs - standard, a date back, and the Command Back E, which had an optional keyboard, allowed an insane amount of customisation, and from memory could connect to a PC. It also had interchangeable front grips.
My first EOS, 30 years ago, was the camera that replaced it, the EOS 100 (Elan), which is much quieter and has better AF ( a cross sensor), and has pretty much the same controls as most modern EOS (and indeed other) cameras, with a mode dial, and top and rear control wheels, whereas the 600/630 borrows from the T90's push button mode controls, still in use in top end models. I hadn't been looking at AF cameras, I had saved up £500 for a new camera and wanted an Olympus OM4Ti, which was a little bit dearer - but the price doubled almost overnight, so that was that. Didn't like the Nikon FM2n (and having since had one, still don't) so decided to look at AF cameras after all, the 600 being slightly ahead of the Nikon and Minolta alternatives. Then the EOS 100 launched, and that just suited me better. And here I am still using EOS cameras to this day...