"I was wondering if anyone has used Amazon Shipping "

I have not and have no interest in using it. There have been a number of posts about it that you can search.

Results seem to be all over the map, like everything to do with Amazon.

There are sellers that love it and then there are responses from others that have had shipments sit on the dock or doorstep for a couple days and are not picked up.

I suspect Amazon has the same issues as other companies -- they can't find dependable people willing to actually show up for work.

I got an invitation email today asking me to set up a conference call to discuss it. I saved it to one of my Amazon folders as a permanent record but I simply do NOT trust Amazon to get it right with my packages.

The USPS and UPS do a great job for me. My packages arrive almost 6 days before the lousy shipping guesstimates that Amazon uses with my products despite me shipping on the last day possible to avoid all their 'rewards'!