Hi,
There is one clear difference between this plugin and official one.
Official one: It is exclusively for the static files only.
This one: It does reverse-proxy setup. Allow you to serve everything, not just static.
It is optional and not mandatory if you want to use together official plugin with this one.
Regardless either perma cache enabled or not, there is a pros and cons of having seperate zone for static files via official plugin.
Pros
1. It will have better cache hit ratio possibly due to less purge.
Cons
1. A extra dns lookup will be required
Thanks