Door Buzzers in Apartments

How many of you have door buzzers that actually work most of the time.

I live in a building where the buzzer keeps going out. A repairman comes to fix is and it works for a while then breaks again.

Do you have a buzzer system that works consistently?

My super told me the buzzer does not work well because it is old and needs replacing. The landlord is too cheap to do it though.