I'm generally very happy with all the services I've tried from Atlassian. Our team is using Jira and Confluence OnDemand happily for over a year now.
We are currently in the process of evaluating changing over to Bitbucket from GitHub as your pricing policies make a lot more sense.
I signed up for a free 5-user account. Then I invited some members from my team in order to get the 3 extra spots you so prominently advertise in the right hand column of the landing page. They signed up too, and I can see that (see attached screenshot).
Except, I can't push anymore. I got an email telling me I have to upgrade. What on earth? Needless to say my feelings are a little mixed with the Bitbucket evaluation right now.
Thanks in advance.
Kind regards, Bojan