Richard, were you considering it for hosting your music, or you have a video? Not too many replys to your question makes me think maybe not many people here are familiar with it.
Yes, I am considering it for that, and from there, will have a link to Sibelius for purchase of scores. To me, it looks good, but I am hoping for some refutation or confirmation of my opinion. The main purpose of the site is archiving, and to achieve this, they offer some useful options.
Love it and use it, and have been for 2 years. They got some new servers a while ago so it's a lot nicer now, it used to very unresponsive. The browser uploader doesn't work sometimes, but you can use the application uploader and it'll work fine.