In my home that I sold, I had a wireless Visonic Powermax+ with many sensors. I loved it for the cost and the simplicity of programming. Also it is made in Israel not CHINA
Although I kept the entire Powermax system, my new, to me, home already had a hardwired Vista10SE with all necessary sensors so I have not yet installed the Powermax.
Hardwired systems are much less prone to "false alarms" but I did not have any with the wireless Powermax+.
I would highly recommend that everyone should have some kind of security system.
It just makes me feel better when I am away from home or at night.
The best time to get a security system is before you get broken into. What you loose in the first breakin will be much greater then the cost of any system. You can find a lot of useful information at www.diysecurityforum.com