Not to be paranoid, but I'm not sure if i like the fact that this has a web component as well where you can browse and/or delete all the files in the directory you point it to over the web. Are your files shared when using this service?
Right at the top of their TOS 'You have sole responsibility for all User Files that you store and/or share on ZumoCast servers through use of the Service. You acknowledge and agree that Zecter will not be responsible for any failure of the Service to store or secure User Files, for the deletion of User Files stored on the Service, or for the corruption of or loss or any data, information or content contained in any User Files.'
Also, is it storing the files on their servers? 'The Service provides the ability to store files (User Files) and access them on a variety of devices including computers and smart phones. The Service stores User Files on a server and allows users to access them from there a number of ways.'