What other business could promote Priority Mail as either 1, 2 or 3 day delivery and not have to stand behind it with a guarantee? Answer, NONE!!
They need to change their advertising slogan to: "We deliver-eventually". A recent example, I mailed a package to an out of state zip code 3 day priority mail. It took 5 days for it to be delivered. What a fraud.
Much better to ship UPS, FedEx or Speedy, they give you what you pay for.
What to write with 17 words remaining? Now ten, nine, eight, seven, six, five four, three, two, one.