In the interests of science, I've undertaken various first-hand user testing experiments over the years. I haven't gone as far as did Cullen Murphy, then the Atlantic's managing editor, when he demonstrated that one could write an entire article without using the words "is," "are," or any other form of the verb to be.* But, as a similar experimental stunt, I once wrote an article without touching a keyboard, relying strictly on voice recognition software to see how well it worked. (The software worked fine; unfortunately, I discovered that I couldn't think without using my fingers.) And I let Air Force pilots wring me out in a deliberately-nausea-inducing mock-combat drill in an F-15, just for the hell of it.
Results of the experiments: Cullen still uses "is"; I still use my fingers; and I have stayed far away from F-15s.
Spurred by this report on the Atlantic's site about a new Bing-vs-Google flap (previously here), I have resolved to try another experiment. I will spend the next week, during which I must finish a "real" article, using only Microsoft's Bing to track down facts online, rather than my usual Google. After-action reports will appear here once I've turned in the "real" article. Necessary disclaimer: I have close friends at and various entanglements with both companies. Watch this space.
*Actually, now I have, at least on mini-scale.