I am happy with my two (one self inflicted) false alarms in 18 months of ownership, the system is reliable and a potential life saver. If you have ever experienced or witnessed a blowout at speed, usually caused by underinflation you will be happy to have TPMS fitted. I cringe when I see a car being driven with an almost flat tyre and keep well clear, an accident waiting to happen.
I also can't get wound up by the little green light which is the only way I can tell my lights are on in daylight, usually with good reason.