I'm sure a lot of people will be moving from Bitbucket to this, Bitbucket's plans were great for hundreds of repos, but Github's ecosystem is definitely preferable.
It's cheaper and has private repos for free and that's it.
The UI is clunky and the community is much smaller than Githubs.
I also don't understand why they try to sell it with the Jira integration as if it was a good thing. The only people I heard saying good things about Jira and this marketplace where working on companies that sold stuff there.