I ship and receive a lot of golf clubs, and car parts, and USPS is just hard to beat for shipping, it just is, the Priority Mail cost and Delivery times are unbeatable compared to Fedx/UPS.
That being said, for the 2 yrs I lived in Atasc Trails (I'm in KW currently), I had to quit using them, terrible, just terrible. I could fill up this page with stories and issues I had trying to use them, it's the Humble PO, Atascocita area to be specific, which is strange, as I always had/have good luck going into the Humble PO, but the delivery people, are just terrible, weird things like packages that had a trace put on them for several weeks getting dropped off on your porch at 1 or 2 in the morning, and a whole lot worse (atleast I FINALLY rec'd those), I lost a lot of shipments.
As much as UPS/FedX are far inferior than USPS in most cases, if you live in Atasc, you have to use one of them. Haven't had any issues from the KW PO, or any where else (the rare occasion issue maybe) I've lived.