My team uses bitbucket for everything, including the issue tracker. Lately we started to develop some scrum techniques and where thinking of using jira.
I was surprised when the integration beetween jira and bitbucket didn't bring the issues. I tried getting them from Json export but had no success at all. I only need a easy way to bring the bitbucket issues to jira, this is really a dealbreaker for us. If there is no option we can't migrate to jira.