I'm not trying to talk anyone into doing anything they don't want to but I will say this about USPS. As most guys on here know I buy and sell a lot of stuff to try out. I ship as much stuff privately as what everyone can see and I have been VERY satisfied with USPS Priority. In all honesty I have probably shipped 200 items in the last year or year and a half and all but 2 arrived in 5 days or less. One stock took 13-14 days for no known reason and a rifle took 5 days. All the rest took 2-3 days. This is rifles, stocks and optics. I alwasys package well and make my own label in Excel, large and easy to read. I know full well that stuff happens but I don't think it's the norm. I DO NOT use parcel though because it can be 7-10 days I don't like it to drag out that long.
It helps that my PO folks are pretty good people too.....
My .02
Dave