The only benefit I can think of is the red light flashing (there are cheaper ways to get it to flash) and if someone ever busts your window and if you are around you will hear the siren....
Besides that there isn't much of a use for an alarm. It is mainly to protect your belongings in the car..... they will take your car if they really want it.... alarm is not going to stop that :-)
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2020 G20 M340 xDrive - Portimao Blue - ZDA|ZPP|ZPX|1CR|1PE|6NW|6WD
2016 F10 535i xDrive - AW - Retired
2011 E92 M3 - AW……………....ED April 29th, 2010 - Retired
2007 E92 335i -Space Gray.....ED Oct 19th, 2006 - Retired
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