To me there is not a lot of differences.
There might be some improvement that I'm not aware of, but so far I think a (used off eBay) regular STX is the better value
10 months ago I replaced my Essence STX (with AD797BR op-amps) with a Audio-GD NFB-15.32 ($270+shipping)
Dual DACs and more amp power.
If you want to use IEM (or other really low impedance) headphones with the STX or STX II, buy a FiiO E11K headphone amplifier ($60) and plug it into the STX/STX II RCA line-outputs, plug IEMs into E11K.
The E11K has an output impedance of less then 1-Ohms.
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