Yeah, I've seen most of them going for 1500+ USD. One even going for 3k! Quite a crazy difference. No idea why these guys are selling it this cheap... but hey, no questions asked!
In theory, it should support Carplay. That's what the ad says. I am convinced that all these units are basically the same one, produced by the same manufacturer, and then sold by all the resellers we see in Aliexpress.
About the surround, I have not decided yet. But it will come down to either wrapping it in leather, or painting it in matte black, so that it matches the rest of the dashboard. Most likely, what will end up happening is that I'll paint it in matte black as a temporary measure, and then use some time to persuade myself into paying an upholsterer to wrap that in leather (and potentially also the center tunnel trim parts, where the gear stick and the handbrake lever are).
Also, I found that there are some universal stick-on bluetooth steering wheel controls. I might look into getting one of those, and sticking it somewhere in the steering column trim, where it is not too visible. Like that, I'll get proper volume controls.