Clean interface, good notifications, good user/team management. It plays very well with other Atlassian software, specially Jira in our case.
It has been a pretty good experience I will recommend it as an optional product if you are done with other version controls.
The best features about bitbucket is the integration it has with all of Atlassian's other software such as Jira or Confluence which the integration is flawless.
However, in some situations it is a little difficult to correct. I already had problems that the tool claimed problems in login while all the information was correct.
It has some features missing which Github offers and is a little more expensive. It is not as complete as Github.
Searching in the files and code is very tedious. Navigating to pipelines and releases are confusing.