I used to use Anarchy (or.. I think they had to change name?) but Arch itself has an installer new (as of last month or so), so I'll just use that next time.
I am testing it. Died on me when applying the desktop config, but I haven't been able to toy with it for long.
It is very, very promising. It spits a JSON that can be used for reproducible installs. It is also very flexible in which you can use the API with custom python install scripts. Very impressive and ergonomic.
Only recommend using them for subsequent installations. You have to get the basics right first, so you can troubleshoot anything in the arch forums