When choosing a company to install your security it really comes down to trust. They will know where you live, what stuff you have and how to disarm your security system. I suggest going with a smaller local company. It is much easier to find a couple of honest employees than it is to find 50. Usually they are more responsive to customer needs because they are local. They can keep prices down because they won’t have the huge overheads of the larger companies with CEO’s making millions, a huge administrative staff, a multimillion dollar ad budget and so on. Check with the BBB, your local Chamber, complaints.com, neighbors and friends. Have a couple of companies give you quotes and read their contracts before signing. Many companies have a bunch of hidden charges that you only find out about after the installation. Every company is going to say they are the best, but they all do the same thing.