I actually use bing as my default search engine in all my web browsers. Barring a few exceptions, the search results are very similar to google.
The only reason why I do this is because of the Microsoft rewards. It's nice to be able to stock up the points and cash out for a gigantic $50-60 of xbox gift cards and get a free game. If I can do that once a year or so, that's justification enough for me!
I don't use it now, but used it around a year ago for rewards, it's been now discontinued in my country.