XRCD Technology

I have received promotional material for these discs, but I don't really know what they are. What I gather is that they have been mastered using 24 bit digital resolution, and higher sampling rate. But I thought that this has long been true of all mastering equipment. Whatever the precision of the mastering process, the final result has to be truncated (or rounded) to 16 bits for the CD product.

The discs I have seen are performances that have always been recognized as superb examples of the original recording process. I suspect that if these discs really are above average it is probably due to the good work done 40 years ago..not the recent mixdown which, at best, can only avoid screwing things up.

Tell me why I should buy one of these things, instead of another SACD.