I spoke too soonI guess it depends on where you are too. In my area at least, UPS has been more reliable than say Fedex and especially USPS. I have signed up for the USPS Informed Delivery just so I know what mail they've lost that shows I should have gotten. It's ridiculous how much of it I never actually receive when the email I get shows the scanned images of my mail that day. Where the hell do they lose it from that point? Same with packages. They will show "Delivered" and they aren't here.
At least with UPS they show up in my experience.
I ordered something on 3/2 that shipped USPS Priority Mail from Ilinois. It's been "Moving Through Network" "In Transit to Next Facility" for about a week now. I was supposed to have gotten it on 3/6 originally. The tracking status page still shows it as "On Time" as well.