the paging systems are a decent type of alarm, and you are right, anyone who REALLY wants what you have is going to take it regardless of what alarm you use, just shy of a pitbull sitting on your front seat...... the only concern I would have is with newer cars and teh immobilizers systems that are factory. Some of these don't like another systems meshing in, with bypasses and such.... do your homework, I find Autostart does have a great alarm/starter/paging system and does sync alot better with oem systems.

A pricey $$ but worth the peace of mind in my opinion.