I sincerely doubt the current cable-operated slideout systems have much in common with the ones from 3 decades ago. Those of us who have the modern systems, if you read the posts above, have reported reliable service. Whether you would buy one or not is certainly your choice, but personally (and I'm no novice at RVing myself) I wouldn't base my decision on a design from the 1980s.
I don't know that I would want them on my large, heavy flush-floor slides that have to be lifted by the slideout mechanism when they retract (as I said, those slideouts have hydraulic rams), but the cable operated slideouts seem to function just fine when properly applied.
Rusty
2014.5 DRV Mobile Suites 38RSSA #6972
2016 Ram 3500 Dually Longhorn Crew Cab Long Bed, 4x4, 385/900 Cummins, Aisin AS69RC, 4.10, 39K+ GCWR, 30K+ trailer tow rating, 14K GVWR
B&W RVK3600