Changing back from Chatter Free Role to Salesforce Role

This article is from the standpoint of Salesforce Administrator.

Once your user is given Salesforce user role, it is harder to change back to Chatter free role. 
(Salesforce role is the one that is given to you as part of your license. 
If you're a large company that has hundreds of Salesforce licenses than this might not be much of a problem.