I just signed up with Yahoo Bing yesterday and out out two ads, one for my short story collection inspired by Roald Dahl and O.Henry, called the Ten Twisted Tales (available at Amazon http://www.amazon.com/dp/B00F2FF2M4).
And the other was for my children's series from which I donate 50% to elephant conservation. Strangely, my Google ad with the headline, 'Save the elephant' didn't pull in as many people as 'short stories for kids' did. (As I write this line, I get a sense of deja vu that I've written this very same line before.)
While I found it a bit difficult to simply resume my ads that I had paused with Google, Bing has an easier solution: it provides a 'pause' and 'resume' button, and I when I hit 'resume; after importing from Adwords, I was up and running. You have to make sure you pay a certain amount before your account becomes active, so remember that.
With Adwords, I kept looking for the simple resume button, couldn't find it, followed the steps and enabled the ads, but it showed as 'campaign ended', so had to copy and redo.
Will keep you posted on the difference between Bing and Adword. Till then, have a good week.