Have had cable slide systems since 2011. Asked the dealer to adjust, on first check up. He screwed it up. A few months later one of the retaining nuts fell off and cable went slack. I repaired easily in 10 minutes.
Later on one of the adjusting blocks went out of line and caught the other opposing adjusting block. Cable broke. Although the slide would continue to operate both ways. Amazon cable repair kit...$20. And 20 minutes work to replace the broken cable. No need to haul it off to a dealer. Easy DIY repair.
Readjusted cables properly and they have operated flawlessly ever since.
I prefer the cable slides to Hydraulic, or Schwintek. I can easily fix the cables myself.