Hulu's ex-CEO Jason Kilar has been extolling the virtues of Vessel, his would-be YouTube rival, for weeks. Today, though, you can finally find out whether or not it's all that it's cracked up to be -- Vessel has launched an invitation-only public beta. You'll have to watch on an iOS device or the web (Android is coming "soon"), but you'll otherwise have a month's worth of unfettered access to the service's early, professional-level content. There's no word on when Vessel will be available invitation-free. Even so, the beta is at least proof that the video hub exists as more than just a well-meaning concept.