What do you like best?
Cumulus is used at my media publication company for easy storage of multimedia components ranging from JPEGS to Adobe CC files. The storage capabilities are astronomical, which is an obvious selling point, and it allows one to see variations of the same file that can all be stored for records, easy access, out-of-office accessibility, and most importantly, metadata indexing (which has its drawbacks, see "dislikes").
What do you dislike?
At the end of the day, it gets the job done, but it is not easy to (a) learn how to navigate, nor (b) avoid glitches in execution. There are multiple ways to accomplish a given task, like search for a file via keywords established at time of uploading with metadata indexing. However, there are such a plethora of options when searching that in many cases it actually makes it MORE difficult to find what you are looking for!
What business problems are you solving with the product? What benefits have you realized?
Obviously in a newspaper/publication setting, the purpose of a program like Cumulus is record-keeping, in a manner that makes a massive volume of information accessible to multiple parties from any given device or location. I cannot speak for the mobile access of these records, but for an office like ours where branches and offices are scattered across a region, this program has certainly proved beneficial in keeping records and files consistent and accessible.