might not be bad for people who need a tailored search... but there are search engines out now that do that... computers for example, have pricewatch, pricegrabber, etc...
but it might be good if your doing a lot of background research into specific studies or areas. but I personally am always too broad to use a search like that... it could be Great Danes, Case Fans, and School studies one day... to Coffee, Flights, and piggy banks the next.