We have geo alarm. We ordered it off of the net, and my husband installed it. It was very easy to install, I could have done it, and I am very UNmechanical. We chose it because it had what ADT and others provided with a much cheaper monitoring fee. Our monitoring fee is $20 per month. We had to sign a 3 year contract, but that was no problem. We also have a system whereby it does not have to be connected to a land phone line, which prevents someone from cutting your lines. Our cost for the system was no more than ADT was charging. We have been very happy with it.
We had ADT at one time and were happy with it, it just costs more for the same service and the product is the same.