Unfortunately, RES isn't currently available for Internet Explorer. Until IE implements an extension development framework that is conducive to RES's architecture, it's not too likely. All of the other browsers support very similar architectures that work nicely with "content scripts" like RES.
RES Pro is the only way to sync up your tags, custom subreddit shortcut bar, dashboard, and other RES settings across all of your computers. Additionally, by going Pro, you help support the RES team to keep these improvements coming.
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A lot has changed. Make sure to visit the Features page to learn about what is new in 4.0. For a more in depth look, you can also visit the changelog and get into the nitty gritty.
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