I downloaded it a few days ago and replaced IE8beta. It seems much better than IE7, but it's still slower than Google Chrome, which is my current default browser. I used to use Firefox (I have FF3.2beta installed as well) exclusively, but it's too slow for me, and most of the add-ons I used to use are either incompatible with FF3.2beta or else I no longer need them. The most important add-on, though, is now available for IE: Foxmarks. That's a lifesaver.
Sometimes IE is the only browser that works well enough here in Taiwan. While a few people here do use Macs and even fewer use Linux for desktops and laptops, almost everyone here is bound to Microsoft Office and Windows Chinese (Zh-TW--Big5). Me too. It's strictly a matter of necessity and price, not of OS ideology: one uses whatever everyone else uses, what one's employer provides, what one is familiar with, or what one needs to do one's daily business.
One thing that annoys me about IE, and about almost every Microsoft Website that I visit, is that I almost always get the page in Chinese because I live in Taiwan. There is no easy way to switch to English, even though my system is English. I need to be able to see and read both Chinese and Japanese so that I can go to Google translate (better than Babelfish, IMHO) and have it turned into English if I can't read it without a translation. Microsoft isn't the only source of default Chinese pages, though, so this is a general complaint to all Web-page developers: Do not assume that the language of the user is the same as the official language of the country in which the user is connecting to the Net! Add a button that allows the user to have the page in the user's language of choice!