It's more "cool toy" than anything else.
It's also
been around for quite a while. (hint: search before starting new threads)
I seriously doubt the effectiveness of any application's ability to stop thieves. Once your 'Book is in their hands, kiss any chances of seeing it again goodbye. ISPs don't just hand out identifiable information to Joe Public. Even if you do get the customer's information, there's slim chance that information belongs to the thief. Even if you get the thief, there's slim chance the thief still has it by the time you apprehend him/her.