I just switched to FCP X over the holiday, hoping to return to work and sell my company on it. This major update would seal the deal, but now to tell them that we cannot take advantage of the complete features because it requires an OS update that would make our other software not work is out of the question.
To me, that's another slap in the face to professional editors on Apple's part.
I have a second Mac that I can upgrade to Mavericks and use this with if I want. However, based on their compatibility page, 99% of the software I use won't work with Mavericks.
Why not make it compatible with at least two versions back? I'm disappointed.