Apple just updated Final Cut Pro X to 10.0.8, which includes, among other tweaks, support for the Sony XAVC codecs up to 4K in the new F5/F55 cameras. Compressor and Motion got updates also. Sweet.
I don’t have an XAVC camera so I couldn’t test the new codec, but the rest of 10.0.8 has been stable on my Macs so far. If you’re not the middle of a project, I’d advise upgrading. (Never upgrade anything during a project, unless you’re absolutely sure the new stuff will solve whatever problems you’re having with your current stuff.)
I love FCPX and I’m very glad I made the jump from FCP7 a year-and-a-half ago. But I’m definitely in the minority among the filmmakers I know in embracing the software.
I don’t believe, as some do, that Apple has abandoned pros. I just think they’ve been a bit distracted by iOS. The updates to FCPX are a great sign that they still care about their professional users. But of course, an awesome new Mac Pro would be an even better sign.