Never heard them myself but read the reviews on Amazon US. Kjk1281 did get a pair and wrote me this...
"If you still have the CX3.00 and CX5.00, you may want to "trade" one of them in for the CX1.00. I snatched a pair off Amazon after cashing in some credit card points for a gift card. Listening to them dissolves any desire I had to buy the 3, 5, or Momentum In-Ear, and reminds me of how long-in-tooth the IE60/80 are."
I do have a 10mm, 28ohm driver, that coincidentally came out near the same time, in the ATH-Sport2 and it is indeed a capable driver though not tuned correctly in the AT phone. Still up to the near Soundmagic E80 level technically and the E80 is better than the 160 and CX5.00. Sport 2 is very bright but is better than the CX5.00 as far as ability goes. Not hard to think this comes from the same maker and if tuned right will live up to the impressions it is getting so far.
Unfortunately, kjk1281 is in Japan atm, and doubtful has both his CX1.00 and 160 with him or he could compare the two directly for you.
So, to bring it back OT, with E80's and CX1.00(if they are really good), the new RHA S500 also impressing so far etc. So, the N20, being much pricier better be a real performer and not just marketing hype.