Ask HN: Is You.com the next type of search engine?

I discovered You.com a couple of weeks ago and gave it a try but I'm still unsure of it. The biggest disadvantage is the horizontal scroll but this is just UI/UX. More important are the search results itself.

I wonder if they just use Bing in the background like DuckDuckGo or if they developed their own search engine. Anybody knows more details?

What do you think of You.com?