[math-fun] Mathematica 10

This question may be premature, but I'm curious what people's reactions are to Mathematica 10. I actually stuck with Mathematica 8 even after Mathematica 9 came out, so if version 10 is to version 9 as version 9 was to version 8, I'll probably just ignore the release of version 10 and stick to version 8 until Wolfram pries it from my cold dead hands, or until version 8 falls to pieces. Or does version 10 have so many nifty features (or boring-but-important bug-fixes) that a serious computer-assisted math researcher simply has to have it, even if the interface is annoying? (Come to think of it, is there a way to run the version 9 or version 10 kernel using the version 8 front end?) Jim Propp