Core Audio Server Ryan Mintz

Has anyone had any experience with Core Audio (Ryan Mintz)?

Or, has anyone had any good experiences, with either product quality, or customer service?

I purchased a server from him over a year ago.
For the limited amount of time I have been able to listen to it,
it has displayed no real sound quality difference compared to a stock Mac mini.

After hundreds of emails, shipping the server and/or power supply back and forth, and exchanging it for several different units, none of them will run for an hour without crashing...

Ryan has only made absurd claims, saying the warranty was void.

Is this an isolated case?

Frustrated consumer