SACD is not the only DSD format. We are talking about players that will handle the DSD files output by the Korgs without conversion to PCM. The only two so far (other than computer plug-ins) are made by......Sony (PSP3 and the new high-end player).
Last year's AES Journal article showing that for playback CD and higher resolution can't be distinguished in blind tests, seems to be matched by a 2004 study in Germany (more restricted in number of subjects) that says the same for CD and SACD. But for me the big drawbacks of DSD are lack of ways to play and, just as important, lack of editing software.
Jeff (who has just discovered iZotope RX, a better cough suppressant than codeine)