Any recommendations for a home security system besides a dog?

Our new house has a preinstalled Brinks home system. After searching reviews, it appears they are a hit/miss in terms of customer complaints and complements. Does anyone have any honest opinions and stories about who is a better home security system provider. Thanks.
Update: Who is a better home security company to go with, ADT, Brinks or some other firm? Any good stories and suggestions?
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