Creating a PLUS account grants you the following advantages:
Fully customized page - use your own background Image and Logo for full branding.
Large file transfer size - the ability to upload files of up to 5GB in size.
No file expiration - 20GB of online storage is included with your plus account.
File history - View a detailed history of all files uploaded since the creation of your account.
Your own domain - Send files with your own custom domain (i.e. yourname.goeshere.com).
You can learn more about the pricing of a PLUS account here.