Well, mine arrived. Pretty darned quiet and low temps, even with a bit of overclocking. I think these can climb pretty high OC wise, especially in an environment where noise isn't an issue...
So far I haven't been able to run it on any pools other than antpool, though, which sucks. 0 shares on nanopool for ZEC and suprnova pools for ZEC, ZCL, and BTG, on 10-20 minutes each, even though all three read as alive (all shares get rejected). Instant 10 shares while revving up on antpool. Guess I'll leave it there for now.
Too bad that I live in an apartment, so these ASICS are probably not going to work for me. Unless the Z9 is about as noisy as the GPU fan on my 1070. That is all that I can tolerate.
At stock, once it's done booting (about half to 2/3 the noise of an A3), it quiets to a whisper. Honestly I think it would be fine in an apartment, I have it running overclocked in my living room right now and my GPU rig is louder...