Grand Slam Supreme Chains

[Bucky205]

I have had the same set of chains on my Grand Slam Supreme since buying the stand in 97. Have replaced with heat shrink couple of times and now have 5/8 " vinyl covering. Chainstill seems fine. I can bounce up and down and no issues. I want some opinions on whether I should break down and spend $50 on a new set of chains? I have never heard of a set breaking.