It is hard to get around the point that people that do have $50k worth of testing equipment and do reviews probably have that equipment from their day job.
But I have the XTZ EDGE A2-300 that I bought last year to try in my studio and it pushed everything else in there into storage. Got it on a Black Friday deal for under $400 delivered. It only gets better when you put a better DAC and preamp in front of it. A/B ing it with my AHB II with my Benchmark DAC 2 and it's pre amp. It definitely is not the equal of the Benchmark yet; but, it is better than my Arcam surround sound receiver by quite a bit, when using the Arcam pre-outs and just judging the power amps side by side.
It’s not that it would replace the Luxman today, but these little monsters are getting really good at demonstrating that, they have the potential to be giant killers in the right hands. These digital ICE amps are after all, at the heart of PS Audio Stellar amps, and most other Class D high end products.
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