I'm sorry but that claim has no credibility with me. Setting up the proper cron jobs, server-side components, and verifying that everything is working under a variety of circumstances will take much more than the 5 mins it takes to install Prey.
Just because you've already done it and you have a pre-rolled solution doesn't mean you didn't invest that time, and don't fool yourself.
You only need to set up a cron job to create a reverse SSH tunnel into your home server. That way from your home server you could SSH into the machine, no matter where it is.
