Phenomenal. I'm sure Liszt would approve.
As far as I could see, there are two recordings of Liszt's 2-piano transcription of Beethoven's Ninth to be found on iTunes. The other is not nearly as good; in the sound sample of the second movement you can clearly hear some wrong notes.
As of my first listen-through, I heard no wrong notes on this recording.
Now, I'll be fair: This transcription has some viciously-tough parts, and had I bought the other recording, I doubt I would have been incredibly upset: The second movement in specific is basically a 14-minute fight to maintain composure, and the other recording showed it: The dynamics were thrown out the window out of the panic induced by the task of merely keeping the notes together.
Not so in this recording. First of all, I must say that just as far as staying together rhythmically, this is some of the best two-piano playing I've heard. Ever. Second of all, the dynamics are just what's written. Wass and McCawley do what any good pianists should: They make it sound like they could do it in their sleep if they so wanted (But it's clear that they were wide awake and aware of the piece when they recorded this).
If you're interested in this transcription, this is, without a doubt, THE recording to get.