In my experience, SmartMoney magazine, while affiliated with the Wall Street Journal, has very little editorial oversight. Knowing what I do about SideStep, this further affirms my belief the SmartMoney employs poor journalistic criteria.
There is no system that can test Priceline because Priceline does not publish their fares. Hotwire does, however, and QIXO includes Hotwire's price in their search results.
Priceline was kicked out of the Connecticut BBB in September 2000 and recently reinstated.