Give me an education about this "PIRATE SHIP" method that has been discussed here.

I just finished up using the Pirate Ship agent for the first time, sending out a 26 pound package to my buyer, for a pair of lower control arms that i rebuild and sell.
Printed out the shipping label, paid for with my Pay Pal account, and everything went so super smoothly, i am totally impressed with doing shipping by this firm.
Thank you everybody, that replied, posted comments, in this thread that i started.
This forum is the best.