We have done well with it. It provides a good way to screen candidates based on their background. It is also a good way to get in touch with people who are in your network, and get referrals for them.
We use Trello to manage our tech queue--it is operation focused. It is easy to assign tasks. It’s a lean tool and working with it is enjoyable. The only problem is that we are not getting enough analytics from it so we are shopping for an additional tool.