UI is nice and clean, though I do have two gripes:

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1. It doesn't let me tell it, so far as I can see, not to anti-alias text. Sure, there's a setting in System Preferences for the size below which AA doesn't get used, but I typically leave that at 8pt and code in 11pt Andale Mono. Terminal lets me turn off the AA, so should any good text editor that expects me to do coding with it.
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2. The syntax highlighting has major issues; it apparently only works on the region that's currently visible, which means (for example) that the closing triple-quote of a Python docstring will be misinterpreted as an opening triple-quote once I scroll down far enough. Working around that temporarily by telling it not to try to highlight on multi-line strings.
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As for whether it'll get me away from Emacs... well, I doubt it. I've been trying other editors for years and not found a better one yet. Transparently opening stuff over WebDAV, FTP, SFTP, etc. and being able to do SVN commits directly from the editor would be a nice start on matching the things that currentl keep me on Emacs.