Hm, that's a shame about the notifications. Their Mac desktop app (obviously doesn't apply that much to you) is pretty decent, I just keep it in the same workspace as my email client. I just see it as another way of communicating mostly, nothing necessarily too special. My favourite feature though is their service hooks, we have separate channels for Twitter (posts anytime our Twitter posts or gets @mentioned), Github for any activity on our repos, so I get notifications anytime someone pushes, creates an issue, etc. Obviously GH already sends email but this way all the communication is centralized, plus I hate email notifications.