The most valuable feature is really the same as our main use case: secure file transfer. I would need to consult with my operation team for any other valuable features.  

I have found almost all the features valuable. 

The functionality of this solution is very high and it has many features. The one feature, which is good is that you are able to plug in your own code. For example, if you want to process files, you can write your own code to parse the file the way you like. You can interpret it, so feature wise, it is rich.