Search ads usually trumps all the other traffic channels when it comes to driving leads and conversions. However, over the past month, Facebook Ads outperformed search ads in 2 of my lead generation campaigns and one of it is for a high ticket laptop.
The lesson I learned is not to dismiss any traffic channel until you have tried it out in promoting a product or service. Facebook may bring success if you are trying to reach out to a specific audience by gender, level of education, workplace or age; Google search, on the other hand, allows you to mine low hanging fruits (people who are already seeking for products or services that you offer).
So far, for most of my campaigns, I am definitely seeing more conversions coming from Facebook than from Google Display Network.