I've been using Bing (and IE) for a few months now, after years of Google and Firefox.

I'd guess about half of my searches go like this:

* type into URL bar * get Bing result * after a quick glance: decide that result is useless * copy/paste into Google

I'd love to use Bing almost exclusively (especially since I'm really happy with my Lumia 630), but it is really frustrating sometimes.