At that company we moved onto blossom.io for 2 months to see how we'd fit. It works well, more of what we want, but we had problems with updates/collaboration (visibility)/issue linking/etc. We worked actively with their product team, but feature delivery was a little slow - would reconsider going back though. We moved onto YouTrack afterwards - afaik, they're still there.
Where I currently work, we use JIRA.