Through the Google search engine, my Webroot security gives it a solid green check mark. No one has reported to them that it’s unsafe. However, it’s not the same as YouTube. Just be aware of that. The website’s description calls it a ‘DVR’ for YouTube. As far as I know, downloading content off of YouTube that is not your own violates the Terms of Service.

So, yes, the site most likely has no viruses, and it should be safe to visit. I don’t know how long it’ll be running, though, as YouTube might take legal action against them.