What is the most usable forum app for Django 1.7?

[Supermario]

I am looking for a forum app to integrate into my project which is going to be quite high-traffic. So I am looking for a mature forum app. I know there are a couple of forum apps listed here:

https://www.djangopackages.com/grids/g/forums/

By 'usable' I mean: 

- Easy to integrate into existing project

- Tested in production environment and showed to be trustworthy

- Has security and performance in mind 

- Has basic functionalities of conventional bulletin-boards 

I have not tried them all, but it appears to me that some are pretty out-dated or even abandoned. And some are not production ready yet. 

So I appreciate your hints to choose the best.