This review is specifically in response to criticism: "it's not really serious".
1. This distro removes systemd from Tails. Systemd (from informal French term: Système D) is an unknown security risk- it's complex, attempts to do many tasks, and loads before many security systems are ready. This is just an educated opinion. Breeches haven't been observed,... yet. But it leads one to question the direction of Tails and it's security.
2. It's much easier to save settings and data on heads than Tails. You can have a clunky persistence partition on a Tails USB device, but its buggy. Keeping an encrypted distro in your pocket is often more than good enough security. If your enemy can connect you to your portable device, and to a particular computer you used it on at a certain time; whether the system partition is read-only is going to be the least of your worries. I'm tempted to say Tails sometimes has impractical, "tinfoil hat" precautions. Sometimes you just need to save things in memory. heads.
3. It's offered as a replacement boot environment for UEFI on certain Thinkpads that have firmware flashed with Coreboot. Instead of proprietary BIOS to UEFI, they can boot from Coreboot to "heads". That's taking security pretty seriously, and a perfect example of what it can do that Tails can't.
heads just works, and fast. It uses only free software and has hilarious -- beyond excellent -- documentation: even if you never read the docs, give it a try.
One issue remains with the choice to uphold software freedom: your WiFi card probably won't be supported out of the box, unless you bought your laptop with that in mind. But if you run a laptop from the Ministry of Truth, you're set. Keep your WiFi card firmware at hand on a USB stick if you want wireless connection.
heads gives a lot of attention to (security) details.
Unplug your USB drive and your laptop will shutdown at once!
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