Having previously used Nitro Pro, we were pleased to gain the additional functionality that Adobe provides. Sending and tracking documents is much easier than on Nitro. The support function is slicker and quicker and there is a wider community of users to draw upon. I didn't like the initial Acrobat DC offering but it's apparent they've really worked hard on the more recent releases to ensure previous feedback was captured and more importantly acted upon. I still believe Bluebeam to be a credible alternative.