Can't comment on authentic Nordost Odin 2 as have no experience with it, but as I posted upthread, I compared the Chinese Odin Gold RCA interconnects (2 sets) in a friends system directly with authentic/real Nordost Valhalla V1.
In that system the Chinese OG replaced the Valhalla 1 running from an Allnic Phono Preamp (can't recall the model number but it's higher up in the Allnic range and retailing at around $10K I believe) to an Allnic L-10000 linestage and then from the L-10000 to a Bryston 14B Cubed power amp. Turntable was a Clearaudio Innovation with Universal Tonearm and Clearaudio's top of the line MM cartridge. Speakers were big B&W floorstander Diamonds. A very nice system.
This was not a blind test but rather sighted. There were 4 of us there and the 3 others felt the Valhalla 1 was a bit more detailed (but in no way really embarrassing the Chinese Odin Gold). That was possible but I felt that the detail may have been more distortion related than real and I thought the Chinese Odin Gold had a much quieter, blacker background and sounded noticeably smoother, more refined and more natural than the real Valhalla 1.
And that was before I cryoed the Chinese Neardost and had it burned in on an Audiodharma cable cooker, which improved it further (more extended at both frequency extremes, more detailed midrange while still retaining all the smoothness, and a much wider soundstage). I really felt that the real Valhalla 1 would end up giving me listening fatigue over longer sessions.
Cost on the Neardost Odin Gold for two pairs of RCA's: about $80. Cost for the two sets of real Valhalla 1 purchased a few years ago used: about $3,000 as I recall.
The Chinese Odin Gold was not only competitive: I wouldn't trade it even for the real Valhalla, unless of course I was going to pawn off the real Valhalla on some poor unsuspecting sucker for some ridiculous price and then just buy another couple of sets of the Chinese OG.
Just another experience that those with an open mind might want to consider.
I have no experience with any Aliexpress Neardosts other than the Odin Gold RCA interconnects so the rest of the stuff may well be junk, but I really like the Chinese Odin Golds, and sold off some much more expensive IC's-but not in the same cost league as the Nordost Valhalla's-after buying just one set of the fake Odin Golds to experiment with. I then bought 5 more sets to completely outfit both systems in the house and pocketed about $500 after selling 2 pairs of reasonably well known IC's that I was using in the main system from a North American manufacturer.
FWIW, I have a couple of friends who are also using the Audiocrast ribbon speaker cables mentioned above who also really like them. I think I'd take a run at those if I felt like changing speaker cables, as opposed to the fake Odin Gold speaker cables which seem to get a bit more of a lukewarm review. But I'm reasonably happy with my current speaker cables so will sit tight.