I almost paid for the family plan upfront, and now I'm glad I tried the free version first.
The Linux installation instructions are utterly dismal.
1) It's unclear when to run a command as root and when not to.
2) Where should the zip file be unpacked to? /usr/local? /home/$USER? What user should own this directory?
3) What user should own /etc/prey? It's created as root, but then that prevents registration by the user account.
I've hacked around a bit, and my laptop was successfully registered, but the agent won't run (permission denied, despite chowning the entire install directory as well as /etc/prey to prey:prey).