As ck2 mentions, our experiences with USPS may be location specific. My experience is the exact opposite of yours, my local USPS shops (I patronize two location

As ck2 mentions, our experiences with USPS may be location specific. My experience is the exact opposite of yours, my local USPS shops (I patronize two locations almost daily) have been outstanding (adding postage to letters that need additional postage and leaving a note in my PO box asking to reimburse them, routing mislabel mail to my address, etc), and my experience at the local UPS/FedEx shops have been underwhelming and their hours generally suck. I've shipped something like 3000 packages via USPS priority mail over the last 3 years, and there have been a grand total of two that have gotten lost (and I'm pretty sure that one of those two was a customer ripping me off). That's a much higher success rate than I've gotten with FedEx & UPS, at lower prices.