Their mods don't look to be a very good value.
* Replace 4 stock diode bridges with Esoteric handmade ultra fast RAM versions
What is this? Replacing monolithic bridges with discrete UF or hexfred diodes? Handmade? They make their own diodes?? right
* Replace over 60 stock electrolytic capacitors with ultra low impedance Rubycon ZL/ZLG caps.
Hopefully they know that most v-regs (LM317s, etc.) don't like low ESR following the regulator... that is a lot of caps however.
* Audiocom Superclock 4-S Master Clock Upgrade ($295 Installed)-
I would use Tent, for far less money and probably better... I don't know what their hard on for Audiocom is.
* Analog Output Stage Rebuild w/Audio Consulting Transformers
Expensive transformers, then they stick with LM4562s for I/V duty... lame. If they are going to stick with an opamp, how about a THS4031/4032? For $1,200 I would expect discrete instead.
So, $1800 for all of this. But wait! The $295 Audiocom doesn't include the power supply... at that price it should. For the PSU, you have to spend $595. Then they start talking about upgrading the transport clock, which is a total waste...