I’ve tried Bing, on-and-off since its launch. It hasn’t convinced me that it’s much of a decision or knowledge engine. Bing has some nice search features but as far as I can tell nothing particularly game changing.
Its preview side categories, recent searches, etc. have been done before by other search engines including Yahoo, Ask, Google, etc. A lot of Bing’s approach seems to be various ways of presenting search refinements, again not new (alltheweb.com the past days of teoma, and others). Its powerset stuff inside I suppose is important–helps Bing against some of the others (hakia.com) out there, but in the end I don’t seem to get better results than Google gives me and I still find Google’s interface preferable.
In practice Bing doesn’t appear to live up to its release claims of helping me make decisions. I don’t see much to justify Microsoft calling Bing a decision engine, so that must have been more marketing hubris than anything.
If the game is going change perhaps that will come from more interesting experiments like Wolfram|Alpha or an alternate company. Then again, Google continues to innovate and change the search game better than its challengers do.