I'm also interested in Shozy bk too. Thinking about buying too.
It seems that they use superior materials like mono-crystal cable, oyaide plugs, Japan made speakers. These materials are usually used in extremely expensive IEM. For example, these materials are of higher grade than those that are used from Campfire audio IEM. The quality of shure SE 6xx's cable can't come close to Shozy. When I look at The Dita answer uses great cable, but when they upgrade Dita answer to Dita Truth, they charge an additional hefty us300. These IEM are priced 550-1000!
It seems to me Shozy bk is best value for 'materials'. The $169 shipped is a steal. Say, if I bought it and didn't like it, I can use the cable to upgrade other "high end" IEM.
Beside the excellent review from
@ctaxxxx , I have read something here that Bk was a champion:
https://www.head-fi.org/threads/earbuds-round-up.441400/page-802#post-12939143