Im finally getting to hear u12T this friday.
My personal favorite is Mest Indigo. Its got best most realistic imaging i have heard so far and most natural and versatile tuning.
I have spent quite a bit of time with Odin, Phonix, EXT, Nio, Sultan, U18T.. All of them have something they do better than Indigo, i.e. Odin has sharper resolution but tuning is too dry and smaller staging. EXT has best treble i have heard but its mids lack clarity, i has wider staging but not as enveloping 3D show as indigo. Phonix is completely different beast, its just not up my alley, etc.
I will also be hearing Thummim and FiR KR5 is arriving soon. So these might be candidates. But so far nothing offers full package i get from Indigo.
That said. None of these iems i mentioned sounded off, harsh subdued in any way due to source. Old version of Obravo C CU made sp2000 run for its money as i was close to maxing it out on power lol. But its an iem on its own league. And i am hoping to see how the updated new tuning version will work with it soon too.
Best part of this dap though for me is that it comes in. What its not considered a small package haha. Compared to M9, R8, DX300, and im sure upcoming N8II its tiny. I just hope it stays that way in future. Dont want them to go se180 route lol