After Atlassian bought them:
* The service I paid £5 a month for became free
* The stability issues started to improve in a dramatic fashion
Today Stash is a great product (IMO), and BitBucket has really improved from having great Jira integration.
I was actually sad because I couldn't justify paying for the premium features (multi-person private repos) in the same way, because it was nothing I needed. It was the best £5 subscription I ever had :)