It is a an outstanding multichannel SACD. Its virtue in contrast to the redbook CD is primarily in its fidelity, although the redbook CD was very good.
Be careful, however, as this was one of those SACDs (like Carole King's Tapestry--also outstanding) that first was released in two channel, then multichannel. I assure you from experience that some online vendors do not know the difference, even when they claim it's multichannel.
Nick