Hinomotocho
Headphoneus Supremus
Same for my ZX100, I decided to sell my HA-2 to avoid the hassle of a "boner" stack LOL, and avoid cable mess
I'm happy with my A15, but the ZX100 did catch my eye when I was in Japan recently, seeing it for the first time in the flesh. Because new iems were my priority I wasn't going to even consider the upgrade - and I did myself a favour and didn't even listen to it. Maybe next year......