I want to vouch for this 100%.

Personally, on my team we use Pivotal Tracker - it tracks our velocity for us and automatically "guesses" our release date based on our velocity. If we aren't happy with the projected date, we reduce scope aggressively. Clients see our backlog and can see when things change. Most of our project planning is completely automated by Tracker - we just create tasks and point them. It's the only thing that has been even remotely successful for us. If I had to give up Tracker for Jira I would quit my job.