I have been using Revit since version 7 and a major issue Revit always had was mass issuing until now.  Xrev is so good at doing what it does we no longer needed a full time person to manage Document Control and instead could deploy those resources elsewhere.  It is by far the best issuing software for Revit that I have ever seen.  

For such little outlay and effort to set up you can save a lot of money with this program.