My feedback is that, other than it looking absurd (color scheme wise), and it trying to be way too vertically compact on the main forum list (the way it organizes subforums as boxes ends up cutting off the titles of anything with a reasonable title), it's also a pain to log into. I may very well just be one of the few that have a different username than they have display name, but it took me getting locked out before I tried to figure out what my display name was actually set to. By requiring that you use your display name (public information), vs. your username (which isn't shown anywhere that I know of) to login, there's other fun things. In that same respect, they are explicitly telling you whether it's the display name or the password that you got wrong, which, although helpful, is problematic for other reasons.