I wrote a few articles and published them there. They were even featured on the front page, but the traffic wasn't terrific. I still check it every now and then, but for the most part I'm not active there. There is a much larger community here. Plus, the HubPages Ad Program works out better than AdSense alone. I may go back and publish a few more articles there, but for the time being I'll stick here.
As for link-building, I think it could be a potential source of link juice. Like HubPages, they use subdomains, but they allow one to recommend URLs and provide a short description of them (100+ words). Hope that helps.