The big deal about IP chainplates is their difficulty to inspect / replace. They are glassed in and require furniture removal
to get to them, once there, you might as well replace. If you plan on keeping the boat forever, I've heard that Titanium chainplates are not that much more expensive.
IF the chainplates are maintained, meaning the cover plate re-bedded occasionally, they last almost indefinitely I'm told.
The other Achilles heel of an IP is the aluminum tanks
are difficult to replace. Mine are going on 28 yrs old, as far as I can tell they are in good condition, I'm in a quandary if I should replace them or not