Rights and User Administration
While it's possible to manage users on HipChat and most of the tools needed, the rights management is very complex. If you need other tools for collaboration in addition to HipChat, you can do neither the user nor the rights management centrally.
With the alternative Stackfield, adding users takes only a few clicks, before you can globally set the access rights for them. All important settings for the use of Stackfield happens directly within the central administration console, whereby it's always clear which person has access to the data!