I've become a big fan of duckduckgo over the past few years as I've grown more aware of the rampant privacy/security transgresisions that flock with you everywhere you go on the web. I like this extension - it worked well enough, but for me it felt like a bit of a compromise so that more people will use it (which I think is a really good thing in a lot of ways) compared to the mix of privacy/security extensions I usually run. That extra protection comes at the cost of lots of manual feedback/whitelisting/blacklisting to pretty much every new site I got to which is a pain in the ass, and is prone to breaking sites which means I've got to spend more time tinkering with the settings. This extension however, seemed to work well enough out of the box and hasnt created any issues with breaking sites.

If you're at all concerned about privacy, or feel violated by companies watching everything you do on the web and then selling that to whomever is willing to pay for it, but arent wanting to spend anything more than a nominal amount of time to protect yourself than this is a great option.