I like that it allows my clients to have their own dropbox account so they can store files privately without them being publically available. It's simple for my clients to use and easy for me to navigate when working remotely. There are some bugs with it but if you're trying to share large files it could take some time to send via email. So far this service has been easy to understand and easy to navigate. We've had great success using dropvault as an online storage place for our clients. They no longer need to worry about storing sensitive documents in the cloud since dropvault encrypts all of their files. And we can easily access their files from anywhere at anytime.