The design is incredibly on-point. The breakpoints for smaller screens work well for me, and everything is where I would expect it to be. The subtle animations and the crisp/clean interface are very refreshing.

Last time I looked at the forums/bb landscape it still seemed to be dominated by phpBB, WordPress' bbPress, and vBulletin. I hope these really fall out of style, as I just don't believe communication online happens in a way that lends itself to those architectures anymore.