Discourse is an open source software platform that has the goal of being the WordPress for discussion communities within 10 years (as of 2 years ago). It is a very modern platform that is markedly different than IPB, vBulletin, Xenforo, phpBB, etc... As such, it has the potential for system shock in any changeover.
Sitepoint is a large website that immediately adopted the software when it was released. Their forums are here:
Their explanation on why they switched gives a coherent explanation of why they switched:
Other reviews of Discourse:
Current users (some pretty big names here for a new platform):
I expect most people to scoff at any such notion of drastic change, since no one really likes change. But, I'd like to people to take a step back from any knee jerk reactions and take a look a thorough look at the platform, the reasoning why they claim to be better and the examples themselves and let me know what you think.