After having had one laptop stolen my partner installed LoJack for Laptops on her new MacBook. This week she was traveling and a bug in LoJack caused it to start consuming all of the available resources on the machine while it was unable to contact the LoJack server. After a bit of poking around I found the offending process. I disabled the process by turning off the execute bits and the machine returned to normal unfortunately LoJack also stopped being able to report the machine's location . . .
It appears, at least on a Mac, that the claims that LoJack is invisible and virtually tamperproof are patently false. A critical file is visible on the file system, appears as a running process, and when
removed or turned off disables LoJack. I think any person who is reasonably competent at tracking down what is happening on their computer could do this in short order. I'd bet that the "bad guys" already know how to do this.
The best that you can reasonably expect of LoJack on a Mac is that it will provide some protection from a casual thief who doesn't do anything obvious like reinstall the OS or replace the hard disk -- both of which would disable LoJack.