It works with a caveat. There is a bug that has been reported here and has yet to be fixed. MXFs are fine to edit with and such, but if you are trying to export to them the resulting file can contain below black information that wasn't present in the original file. Check your exports.
Here is a thread on it:
Re: Data below black level 0 in h264 mp4 files.
(look at the waveform screen captures in the middle of the thread.)
I am still having to use CS 6.03 for all of my mxf exports until Adobe resolves this issue. Been reporting it for years now. It's a pain.
