I signed up for it after my letter carrier misdelivered two pieces of my mail in less than two weeks after having maybe one mistake in the previous decade. I think my post office stopped using the same carrier on the same route everyday and instead tried some sort of "load-balancing" scheme where a carrier's route can change based on mail volumes.

By seeing the mail I should be receiving, I know to talk to m neighbors if it doesn't show up in my box within the next day or two. We continue to have delivery issues about every couple of months.