Looking at Prime, there are a few free audiobooks that aren't tied to Audible. There are more free ones tied to Audible. What are the pros and cons of Audible?

Audible has a huge library of audiobooks and is incredibly easy to use. An audible subscription allows you one free book per month and allows you access to any book within their special library for audible members, it's a huge library too! Obviously the largest con is that you don't "own" the content you purchase, as is the way with any content streaming service, but pausing or cancelling my subscription doesn't seem to stop me from being able to access audiobooks I previously purchased which is nice.