I switched to DuckDuckGo a few weeks ago, I've consciously switched from the big G for a lot of reasons - mostly privacy.
I dunno how good DDG is - mostly because I'm not looking for hard to find things, so there's no real vector to compare on. One observation though: it's a haven for piracy. You search for a non-major motion picture, you'll get as many DDL and streaming sites as you will information about that picture. Books are the same. No comment, just merely observing.