"NEVER" is pretty definitive. I trusted Valin on the Magico Mini 2 and Airtight Supreme cartridge, at least enough to go listen to them before I bought them. His reviews were well written and described pretty much what I hear from those two components. OTOH, I disagree with him about the Pass Class A amps. Reviews are just one opinion and can often be helpful in identifying components for a potential audition. Those class A lists, though, are something else.
