I'm a bit late to the party, Steve from GamersNexus did a proper review of Billet Labs' monoblock showing his unmitigated autism.
The cooling block is made out of C101 copper, entirely in the UK. This explains their high production cost and should shut the Lilith simps still coping about stuff being cheaply (not really) made overseas.
Yeah, this thing is designed for the most autistic type of gear snobs.
I love their sustainable packaging. LTT probably gloats about being all environmentally friendly but doesn't actually care, since Lilith needs yet another massive flat screen TV that will eventually go into the bin.

These guys are using wooden boxes with stuff laser engraved on.
Again, considering how Linus simply got some Alibaba bare bones laser engraver kit that was meant to go into the end user's housing to be sold as a white labelled product and ran it without protection, I would say it's another thing Billet is doing right.
GN used laser scanning to see the flatness of the mounting block, a device Lilith would only be able to do laser engraving with and hopefully gets a Darwin award. The block does deform slightly after repeated mounting, though that's something an average user will likely not encounter.
Conclusion:
Compact, tiny device with good/better than OEM air cooler performance. They are quick to respond to advice.
GPU pressure patch was exceptional.
Increase mounting pressure for CPUs.
LTT sucks and their simps should just eat a copper hammer.