I can only speak from experience, but my initial installation lasted nearly 25 years with no measurable degradation until it was damaged by lightning and replaced (insurance).
Haven't had the new system long enough to expect any issues, but the installer was not a low price one. And for those maintaining that the price has come down - the new system was almost double that of 1994.
A large part of the increased cost was the red tape that has multiplied in the last 25 years, but I suspect that because the insurer was paying for it that may have upped the price as well.
John
JDNSW
1986 110 County 3.9 diesel
1970 2a 109 2.25 petrol
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