I was having a special trannie installed in my GG as my voltage is very high in my house - 252volts most of the day. So - when in the workshop...
I have new PCM and DSD engines in it. I have spent most of the time listening to PCM so far - it is incredible. It has quieter noise floor, more resolution, faster and just more vivid. I have only listened to dsd engine a little thus far so am not yet able to competently describe the benefits but I would say more resolution but more real / organic sounding.
Have you been able to compare these new engines in the GG with other dacs? Like dCS or maybe the Trinity?