In all honesty I don't really require a security system as nearly 99.9% of the time someone is home. (But what i do have is a 2 year old escape artist) But all this stuff is here and I might as well make use of it. If i can find some good software, I may just go the dongle route. I have heaps of sensors and home automation stuff all over the house. (flood sensors, window contacts, CO sensors, electronic doorlocks, temperature sensors, glass break, thermostat, PIR, Cameras, etc.) that were all connected to a security panel. through the security company's app, you could open the doors, change the temperature and everything. it's a neat setup, i'm just not interested in the 60 bucks a month they want for it.
I may also try hacking the panel and see what I can do there. It works and everything, I just don't have the code for it so I can't configure any settings or bypass anything.