Eshan Singh
Eshan Singh reviewedDuckDuckGo Privacy App & ExtensionPrivacy, simplified. Available on all major platforms.
 RecommendedPros: 

Very simple, fun name, extremely useful !bang syntax, built-in themes, fairly reliable, good for developers

Cons: 

Privacy claims are somewhat exaggerated, search algorithm kind of sucks

Seriously, the !bang syntax alone makes it worth switching. Google's site:something.com syntax is somewhat equivalent, but man oh man is it inconvinient in comparision. Code results are excellent - often it's given me a more direct answer than Google.

Eshan Singh has used this product for one year.