Really depends a great deal on how much they've been abused by surges. I have Furman units that are still going strong after 20 years. The SMP feature adds a great deal to the longevity compared to simpler MOV only surge protectors.
I can't remember if my PS Audio AC box offered up any AC protection or fidelity trickery, but one day...just out of warranty...it went black and belly up. Tossed it into the trash.
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