Pros
Unique business model. Actually makes a profit unlike many other 'unicorns'. I have a lot of faith in the direction of the company. My team is full of great people who help each other out. While the code I work on today is a bit old, the newer stuff the company is working on is right on the money for where we should be going technically. You get to work on software that is used everyday by millions of people. There isn't anything else like this in Australia except maybe for Google. The company is constantly growing so there always new opportunities if you are ambitious.
Cons
Like any successful software company there is a bit of clunky old code you have to deal with from time-to-time. Your experience at the company can change a lot depending on the team you are in. There are some awesome low level managers (like my own), and some more average ones. In general I would say most of the companies problems stem from the HR department. There seems to a lack of experience and vision there. They just feel disconnected from the rest of the otherwise awesome company.