I like that it's so easy for my employees to use, they've been able to upload documents without any issues from anywhere there's an internet connection! It also allows them to track which part of their file has already uploaded in order to keep time frames as short as possible because some companies have strict deadlines.
There are no downsides at this point except maybe more features would be nice but those can probably only come with additional cost/resources. This software really helps us organize our workflows by tracking who did what when uploading each document into the system.