I've shipped hundreds of packages through Click n Ship. I've only had 3 packages get lost since I've been using the service. In all three instances the DC showed up as being delivered. In those cases I've always thought that the package got to its destination and someone jacked it from the mailbox or the front door. I've reshipped the packages and added Signature Confirmation and not had a problem.

The local post office has an indoor package drop off bin that I use almost exclusively, so it comes it handy.

The best part of using USPS Priority mail is that you can order boxes and they send them to your house for free.