I bought this CD for the first piece on it, Synaphai, on a whim, and I was not disappointed by it. Synaphai is a wonderful piece. Within the musical environment here - the huge, searing quarter-tonal cloud of sound produced by the orchestra - you might think the restrictions of the piano would render it obsolete, but the atmosphere here is spectacular. The percussive piano notes shine out brilliantly, and Xenakis creates a completely alien sound world. Aroura and Antikhthon are equally other-worldly, though not quite as interesting as Synaphai (that's what really stopped me giving it 5 stars), but all the music here is performed fantastically.
A very interesting CD, and a great one to get you started on Xenakis' music (DEFINITELY at this price...)