It is good, I have been using it for almost a year. But I found the quality of results to have gone down as they seem to remove words from searches now, you have to explicitly quote them. It reminds me of how google behave in that sense.
Yeah, it's like they're optimizing for very specific metrics that no longer correspond to what users actually want in a way that has negative side effects. Perhaps there's some short phrase that could describe such behavior...;P