Here is some good information on the SHM/Platinum SHM.
Most, if not ALL of the standard Japanese SHM discs are the identical masterings to domestic releases here and the UK.
The so called Super High Material is purported to have sonic benefits, which are ultimately useless if you are ripping to a server.
The PLATINUM series is a different animal. These are made with the following method:
DSD transfer of flat master tape>176.4/2>Mastering>44.1 for CD.
I have found most of them to be much quieter and more dynamic that their standard "remastered" counterparts
although a bit more laid back and less exciting in some cases.
I have probably around 30-40 Platinum and around 100 SHM discs.
great to know. Thanks!