I've been lurking around the Black Mesa Forum since BM was first released as a free mod/remake of Half Life back in 2012 and remember being very impressed by the forum software even then. This brought the WoltLab name to me for the first time and clearly I never forgot.
I like the way the theme has been modified, the slickness of navigation, the glowing buttons and the floating arrow as you move up and down the page. Whoever modded it has done a first class job and it's largely the reason I chose WoltLab Suite in the first place, apart from the price being competitive.
They also have a very robust security system, much like the BM facility itself and you can now logon using Steam.
It got me wondering whether WoltLab should create a showcase page for sites using their software, so that more people become aware of it's availability and finesse.