We did use Bing exclusively when working on Bing (because you have to dogfood your own stuff). I liked it quite a bit, but a couple of years after I left MSFT I was not so keen on dealing with delays in my workflow because of irrelevant results and I wasn't in touch with my team to report issues. So, I made a conscious decision to switch to Google. Occasionally, I might use Bing for Image Search. However, Google's image search is very good these days.
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We did use Bing exclusively when working on Bing (because you have to dogfood your own stuff). I liked it quite a bit, but a couple of years after I left MSFT I was not so keen on dealing with delays in my workflow because of irrelevant results and I wasn't in touch with my team to report issues. So, I made a conscious decision to switch to Google. Occasionally, I might use Bing for Image Search. However, Google's image search is very good these days.