Given that it appears to rely heavily on community response its a bit of a chicken/egg problem... it probably won't be too stellar until a community builds up - but it may not hit that critical mass of users due to limitations of the small community.
Unless I misread, and the community component is more for enhancement/refinement.<
I don't think it needs input from the community to work. As they state:
In today’s Internet, malware can lurk on even the most trusted and popular websites. We can keep you safe from attack, even if you’re the first person to stumble upon malware-laced content. How does this work? When the bad content attempts to load, our behavior-based profiling algorithms identify and intercept it in real-time, before it installs itself on your computer. <