Have you heard about scour search engine? What can you say about it?

Scour seems all right for providing interesting search results and information about them. The user relation principle is interesting, but I'm pretty sure that google does more or less the same type of user based filtering, expect he does not let us know as much as scour does.
Though, it seems to be limited to three pages of search results, which I find a bit too few.
http://www.scour.com/search/web/phpbb%20seo
http://www.google.com/search?q=phpbb+seo

Talking about referrals, scour is not a significant source of traffic for my sites, but it may depends on the type of sites too. let's just wish them a happy indexing and growth, we all need more quality search engines able to bring visitors to our sites