You can over-clock 3 Z9 minis to 50kh/s. So compared to 3x Z9 s batch 1 at $6000, this one at $10000 is heavily overpriced.
At 1500+ watts, massive increase in db/heat, and a reduced lifespan, yes. The A9 is 650w + 3 week head start for the first, day 1 orders. This is coming from someone who has 4 z9 minis on the way. Also, it's very doubtful, but no one knows if they have contain enough memory for the upcoming 144 equihash parameter tweaks.
Someone measured Z9 at about 380w at 15k, I did not, but mine runs at 54C, fan at 65%. So minimal heat or noise. And at current profit level power is pretty immaterial. It will become an issue much later in life, by then most coins may have already forked.
Edit: And there will be only a week's head start at max, I think, as Bitmain should be shipping rest very soon.