We (18F/GSA) have been using DHS's tool in production for a few months now, and have fixed various bugs as they've come up.
Before that, pshtt's methodology was replicated in a Ruby tool (site-inspector) that we grafted HTTPS/HSTS detection logic onto, and had that running in production for a year or so.
So in terms of business logic, I think it's pretty mature. If you mean things like having it formally audited or having a dedicated development team, it hasn't gotten there yet. But the more people that use it, the more mature it will get.
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How mature is pshtt?
We (18F/GSA) have been using DHS's tool in production for a few months now, and have fixed various bugs as they've come up.
Before that, pshtt's methodology was replicated in a Ruby tool (site-inspector) that we grafted HTTPS/HSTS detection logic onto, and had that running in production for a year or so.
So in terms of business logic, I think it's pretty mature. If you mean things like having it formally audited or having a dedicated development team, it hasn't gotten there yet. But the more people that use it, the more mature it will get.