Moscode 402Au

People in thins community speak very highly of Moscode's 402Au Hybrid Power Amp.

I personally heard a 402 prototype (pre-Au) a few years back and was quite impressed.

Though I cannot find info on their website, I have learned that they offer what they call a "Super Upgraded!" version, which includes Mundorf Coupling Caps & Vishay Resistors. I believe that this upgrade raises the cost by around $1,000.

I was looking for feedback from anyone who owns or has heard this upgraded version, or has compared it to the standard 402Au.

How does the upgraded amp sound?
How does it compare to the standard 402Au? ...What performance improvements are obvious?