[Angel-Wings]

Hmm - I wouldn't use it. Security system have to be open, that one requires Ioncube in order to run so this makes another PHP extension, another additional thing that needs to be cared off.
Maybe invest the money in some books - Suhosin / mod_security are maybe better solutions because both do the analyzing, filtering on an earlier level before the PHP parser gets active. Just want to say it's maybe useless to prevent PHP scripts from doing something with another PHP script - that should be done before the script gets parsed and the code gets executed.

I don't say this software is useless, just that there're some other, more open solutions available that maybe fit better.