I am one of the people who are majorly pushing the site right now (I posted the invite dump thread on /r/redditalternatives) and I am an active member/moderator. I really like the site and the only thing that is keeping me from using it as my primary site is activity. The only major drawback right now is that they haven't quite finished working out their moderation process quite yet so moderating is a little tricky. However, the admins are quite active, so if things go wrong, you aren't in too much trouble. Besides that, I absolutely love the site. I'd recommend anybody come and check it out and see if the community is right for you.
Ah I requested an invite code from them and am still waiting. I'm interested in seeing what it looks like. For now, hubski is getting a shot. Still figuring it out slowly but so far it isn't too bad. I like the discussion orientation build of it!