@tinyitx I have ordered this one. Mine is about to ship after wait of nearly 40 days. I am in their QQ group. It appears seller has small workshop where he prepares them - hence longer wait times. But he seems a genuine person.
That Yuan 500 version is now 600 and called Youth version. Standard version is Yuan 900. About quality, he mentions that, Youth version uses same CNC process and material as standard version. But surface treatment is different between these two versions. It also appears that he has improved upon some of shortcomings of earlier version of clone.
Similarly, I had checked a lots of Ghost clones on Taobao. Summary from my end;
Formula clone - expensive but probably best clone. It even goes to improve upon some shortcomings of original Ghost S1
Kevcases standard version - near replica of Ghost S1 except may be magnets ?
one which
@hereforthefeast bought - nice balance on quality and price
Kevcases youth version - probably most VFM variant going by few available reviews and discussion in their QQ group.
Aklla - I would personally avoid these. Build quality is okay-ish and design deviates a lot from original Ghost S1
Acat X1 - actual product pictures are very pleasing for what it costs but delivery estimation is 29th October - it does not seem practical to wait that long.
Wdean Dora D1S - not very sure about quality but steep pricing of about USD 212 and lead time of 3+ months is putting off.