We've just set up our CI in it (set it up as a Gitlab runner), it seems to work fine. To add more complexity, it isn't even a native iOS app but Nativescript. I think we use it to make the Android builds as well.
For $475/month, I hope you're able to use it for more than just iOS builds.
I know I'm too hobbyist- and small-business-minded for lots of folks on HN, but that monthly fee is a mind-boggling non-starter for me. I know that cloud services are never the cheapest option and I don't want to come off as a skinflint, but AWS' Mac pricing is just absurd. Two months' rental pays for the machine outright (three, if you upgrade the RAM or storage). I wouldn't leap into running a public-facing service on a machine parked in the back corner of an office somewhere, but it's not a big deal if your CI/CD machine goes offline for a few minutes if power or data connectivity stumbles.
I've worked for a startup where we begged the IT folks to just buy us an M1 Mac Mini to stuff in the closet somewhere, or at least sign us up for Mac Stadium or something, but it was borderline impossible to convince them to do that.
Talking to DevOps folks to spin up two dedicated instances on AWS? I had access within 10 minutes.
We've just set up our CI in it (set it up as a Gitlab runner), it seems to work fine. To add more complexity, it isn't even a native iOS app but Nativescript. I think we use it to make the Android builds as well.