I can't read japanese but I can see it says Sennheiser IE8 remold + 2 drivers http://www.hfi.jp/?pid=31172510 this should be interesting!
HiFi International is a Rooth reseller and Rooth and UM are sister companies in the same building so it would make sense that they both offer similar services. From what I know, the Rooth products have a sound closer to the JHA sound while the UM products are closer to the Westone sound, although not having heard the Westone custom IEMs or UM CIEMs I am basing this off my reading and talking to owners of said CIEMs.
I was comparing the NT6 with the SA-43 last night and then I tried to hear different decay times with the switches in different positions. While I did notice longer decay with the bass switch on vs. off, I did not hear any audible difference in bass decay when the presence switch was changed on vs off regardless of the bass switch position. The presence switch changes the tone of vocals for me as when it is on the vocals take a more nasally yet more forward sound than with it off.
My reviews usually take about 2 months unless other things come up as they have recently. I do put a lot of comparative listening in as well as source matching, and that is after I get used to a custom IEMs sound signature and mentally try to figure it out. Some IEMs sound great right away but over time you realize they are far from great while other IEMs don't impress until you have had time to really understand what they do in a special way. I am looking forward to listening to them.
Also, Heir Audio has been added to the manufacturers list and I am conversing with the Wizard...