That's a nice looking theme and there certainly is a little bit of retro Simple Machines Forum in the topics list. I did, however, find it annoying that on everypage you get the full-screen header. No matter where you go on the demo site, there is no content when the page loads without scrolling.

Maybe a few more templates are in order...

Either way, it is brilliant that theme designers are thinking about BBPress. As a core product alongside WordPress, it really does a good job integrating with WP and needs styling love like that.