I briefly used it because I was planning on searching for...well, I don't even know what I was searching for. But I decided to stop using it quite quickly due to the fact that most of the "good" sites I'd heard about didn't seem to be available anymore, and it was far, faaar too easy to blunder onto some less savory stuff - illegal images, drugs, extremely explicit and illegal videos...
Poeple using those sort of thigns are highly monitored, unless a proxy is used - and i decided not to risk stumbling upon some dodgy stuff.