Acrobat DC is available since one year. Beside a new name, a new version numbering scheme and the fact that Adobe prefers renting over selling the application, the most important change was the new user interface.
Unfortunately in daily production it turned out that for experienced users the new user interface is more complicated than the well known interfaces of Acrobat 9 and Acrobat XI. During the last year there were serveral updates with small improvements of the user interface but at the end of the day more clicks are required to execute most functions. This was also one of the reasons that there were many post of unsatisified users in online forums.