Mine are at least 20 years old. Just had to refinish due to rusting after being in non climate controlled environment. Again, I am not sure how you can say weight plates do not perform. My only issue would be is if you are getting new ones off the site, I had flaking issues of the paint and no longer have those so, if buying new, I would spend same amount elsewhere, if buying used on a discount, they are fine.
Performance
Value
Build Quality