It's not as valuable in and of itself as monitoring SMART counters. We've only had a single SSD report failures during a long test, and it also reported an unco

It's not as valuable in and of itself as monitoring SMART counters. We've only had a single SSD report failures during a long test, and it also reported an uncorrectable error. However, not finishing the test is a good proxy for if a drive is overloaded and less able to perform routine housekeeping.