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Some folks will say a shock is not worn out until it breaks or leaks.The OEM shocks on my 02Z had 62k on them and just didn't rebound and keep the car flat like it did 20k ago.
And of course,new parts feel better than old,worn parts.
The C6Z06 shocks ( from Gene on this forum) were a SOP 50% improvement over the worn OEM,and then I went with the brakes & tires to complement the package.
As always,opinions diff and every car is diff.Thats just my take.