This plugin is amazing, I bought the PRO version a few weeks ago (I was anxiously awaiting its release) and it works like a charm.
We have over 40 contributors and 10 authors to manage and a system like this is a god send. It makes tracking your authors progress a lot lot easier and it makes the accounting side of things a walk in the park too.
The fact that it is integrated with Google Analytics is amazing, there are many post view plugins out there which track visits to a page, but there is nothing better than using verified Google Analytics data when it comes to paying your authors for views.
I would recommend this plugin to anybody that wants to pay their authors per word, per views, per comments, anything! This plugin has it all.
Furthermore, we had an issue with the plugin when we first bought it, and the developer of this plugin was very quick and helpful to respond to my issues and got the problems fixed up straight away and an update pushed out.
If I could rate this 10/5 I would.