I was broken into recently and had some cash, watch and laptop stolen. Claimed off the insurance. There's a 200 CHF excess (and the insurance premium, but I assume you still pay that).

Unless I get broken into once every two months, it's cheaper to let them steal stuff and claim, than to have an alarm with a service contract.

Bear in mind that if someone breaks in and runs off when the alarm sounds, you'll probably still need to claim off your insurance for damage to the property caused by breaking the door/window etc. I know you've bought the alarm already, but I assume there's a cooling off period.