Hi there! I use Ajax. I do not have any other experience with security systems because this is my first house after I moved from my parents. Actually, I can recommend that company. I like they provide a 24 h support line for all their clients for free. They are not DIY products, but professional ones. So, everything connected to quality and customer service is on the top! By the way, if you are not sure, just call them, they will consult you for free. Maybe you do not need any of their devices and they will estimate the costs.