What do you think of sites like Kialo.com?

For those unfamiliar Kailo.com is a site somewhat similar to tildes in that it want to encourage rational discussion. Although it is also significantly different than tildes because it seeks more to organize the discussion into claims that are evaluated independently.

I tend to think the site has some potential and there might be ideas related to it that could benefit tildes. I'm interested in what aspects the community here likes about the site and what aspects might be worthwhile to incorporate.

As a side note, do sites wanting to encourage rational thinking need more facilities to encourage the use of sources. One thing I've noticed about Kailo is that it's not every concerned with sourcing their claims with evidence.