I've been using this software for a while, since there was no UI and now I can say this project has grown up, its new features are amazing, I just tested them and they work perfectly. The last wifi-location feature indicates a reasonable area where the laptop may be, although the screenshots and pictures give you a lot information to "prey".
This is one of the best "stolen laptop" software, besides it's free and open, and has very good feedback with the dev team's mailing list.
Give it a try, you won't be disappointed.