Received some guests today.
Of the 3, based on my immediate first impressions, the Nio and Z1R are the clear favorites. The Z1R is really impressing me on this second round. Holy Mary Mother of Balls does Z1R's bass sound good through the M8. Shanling's stated intent to provide a signature as smooth, powerful and alluring as carved jade is really coming to fruition here...Z1R + M8 is possibly the nicest standalone bass I've heard in a portable setup. Any fears that the M8 and Z1R wouldn't compliment each other well are entirely unfounded to my ears. Could the Z1R be the more v-shaped compliment to Ely I'm seeking...time will tell. The treble on the Z1R is also really nice though since getting used to Ely's treble it's not quite as impressive. The treble on Z1R (stll) is a touch metallic at times...but the same was true of my Solaris SE and I was able to a) get used to it and b) fix that rather well with some EQ. In any case I've got a newfound love and respect for the Z1R right now. It also helps that the longer stemmed sedna tips (that I didn't have before) seem to be entirely mitigating any fit issues I was having. Further, my source at the time of owning Z1R was the n6ii + A01-- that board tended to bump the mid-bass slghtly and that may have exaggerated the slightly veiled mids on Z1R as while I still notice it to some extend it's not bothering me as much now. Really liking the bass on the Nio...it's a bit more technical/detailed than I was expecting on the whole...it's a fun and engaging listen though if I were to own one I'd probably EQ down 2 and 4K by a couple DB each. The M9 has failed to connect with me so far, but I will try again. Initial impressions are that the M9 is like a u12t with thicker bass and more personality-- neither of those two IEMs seem like they will take down Andro and VE8 as my favorite BA IEMs. More impressions to come.
Edit: Any of you Z1R owners out there who have access to a Shanling M8 or are contemplating one...do what you can to check it out. It's an absolutely masterful pairing.