How good are home security alarms in apartment buildings ?

Are home security alarms necessary in apartment buildings. We own our condo and were considering installing a home security alarm. What do home security alarms do, what are they capable of ? Is it worth paying $ 30 a month for an alarm ? Is Brinks a good name in the alarm industry. Thanks in advance for any... show more Are home security alarms necessary in apartment buildings. We own our condo and were considering installing a home security alarm. What do home security alarms do, what are they capable of ? Is it worth paying $ 30 a month for an alarm ? Is Brinks a good name in the alarm industry. Thanks in advance for any suggestions or ideas.
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