I received the Led Zeppelin SACD SHM Japanese limited box set yesterday. I have listened to portions of the first four discs. My initial impression is just O.K. Despite several rave reviews that i have read, I do not consider the sonics outstanding, just O.K,, certainly nothing special. I agree with a Rja, the disc quality depends on the quality of the master source. I think the Dire Straits SHM CD's sonics are much better than the Led Zeppelin SHM CD's sonics (at least Led Zeppelin 1-4).