Upload & Sell: Off
USPS is so convenient. Free pickup at your house, shipped items are delivered (hopefully) in 2-3 days. I've had my share of nightmares as well. One package earlier this year, my buddy sent me a Mac mini, I never received it. They backtrack it, they tell me it was delivered to my house, look in the bushes. Nope not there, so then they launch an investigation, which could take a week. A day later they tell me it is on back at his local post office. Come to find out that it was sitting at his front door, and he was now on vacation so it was sitting out in the elements, while he was out of town. Luckily we were able to track down a neighbor to pull it inside.
Their logistics management is horrible. He had my current street address, but an old zip code in his phone for me. Turns out that they don't validate addresses when you go to a physical office. When you buy postage online from USPS.com they validate the address.