My absolute favorite part of the Sharefile experience is how quick and easy it is to use. It's also pretty intuitive, so even a person not familiar with it can quickly figure out how to do everything they need to do.
The last update featured a couple of changes that added more steps for us to share files, but I had discussed these with their development team and they gave me assistance on how to work around it. So there really aren't any things that I dislike.
Before, we had a server dedicated entirely to storing files. Each time we needed to send large files to the client, we needed to remotely log into the FTP server, set up a username and password for each folder, then log it in an excel spreadsheet. With sharefile, the entire process has been sped up from about 10 minutes down to about 30 seconds. Our company sends a lot of large files, so it was something we dealt with on a daily basis. Additionally, there are no more issues with space, because we are not hosting all the files we are sending ourselves.