Ask HN: How a responsive website builder raises 1.5 million?

Y Combinator backed startup WebFlow raises 1.5 million. (TC news is here: http://techcrunch.com/2014/03/11/responsive-website-builder-webflow-raises-1-5-million-from-khosla-tim-draper-others/)

IN 2014, even there are lots of services and alternatives, how these kind of startup plan to build business and raises 1.5 million seed invesment?

I think product is not so impressive and the problem they solve, already can be solved many different, easy and cheap ways.

What investor and entrepreneur think about that?