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While there is a rather significant security issue (which I guess is pretty much analogous to privacy) at the moment, outside of the current zero-day exploit, IE has actually gotten much better over the years. In fact, the biggest reoccurring security issue that I see related to IE is when people don't update it. I still see IE6 being used sometimes, usually on Windows XP machines. Now THAT is a good reason to ditch IE over security/privacy concerns, if only for a current version of IE. Except I don't think that IE9 will run on XP, so in that situation you have to chose Chrome or Firefox. Another issue, although less of a problem that people using hopelessly out of date builds of IE is that Active-X, which can and sometimes it used as an attack vector, is supported by IE, whereas Active-X is not supported by either Chrome or Firefox.
On the other hand, IE9 makes better use of hardware acceleration than other browsers, which at times can have quite a noticeable impact on speed. Firefox and Chrome make better use of HTML5, on the other other hand. On the other other other hand, IE9 has better built in anti-phishing features than other browsers, if that is a concern for you. IE9 is not the slow old dog that IE of yesteryear was, and while there are legitimate concerns about the current security hole, a patch is expected on Friday, September 20. I probably wouldn't use IE9 until after the patch, but after that I wouldn't be afraid to.
I use Chrome 90% of the time personally, and Opera and Firefox about 5% each. I stopped using IE when it was IE7, and just never went back.