I've used Active Admin a few times [1].
I can't really comment on Wallaby, but AA does the job, although documentation is a bit a problem. I had to dig into the code more than a handful times to figure out the correct way to customize a certain form input. Also AA_addons[2] contains some useful custom input fields.
The aim of wallaby is to make extremely complicated customization possible in Rails way, it's not just about custom input fields. It's a very different thinking from AA.
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[ 2.7 ms ] story [ 28.1 ms ] threadI reported a simple XSS attack as an issue, might be worth a decent audit to make sure there are no other potential holes.
[1] https://github.com/activeadmin/activeadmin [2] https://github.com/platanus/activeadmin_addons