I have an eighteen year old cable system slide that is still working although I did have a problem with the motor, the rest of the unit seems to be solid. I recently looked at a similar sized model only a couple of years old and wasn't impressed. The rails were only about half the size of mine, and the drive was rack and pinion. If the rack were to break I see where it could be a major problem closing the slide. I haven't looked at many units but my guess is that I will probably not find a newer unit that has as sturdy mechanism as the one I have now. Further investigating is necessary. JMO