I have at least one car/truck towed to me every month for a engine replacement/repairs due to remote start devices. If a mouse gets into the engine bay and destroys the serpentine belt (or derails it with their body) the vehicle runs till it overheats or worse. I've also seen it happen to timing belts,coolant hoses...etc. I've seen oil pans/oil lines/transmission lines/power steering lines rot out and lose all their oil overnight.The car/truck runs till it doesn't, or it destroys a component because of lack of lubricant.Yes it happens.
If your car is running,you should be in it as all those lights and warning bells going off do no good if nobody is home to do anything about it. Two weeks ago a fairly new car in town burnt to the ground because mice had chewed through the fuel return line and gas was spraying everywhere for about 5 minues till it finally was engulfed in flames and burnt..taking most of the garage with it. Not a pretty sight.
I won't install the systems and I warn people about them as well. I'm sure I have saved numerous cats lives. They like to snuggle under hoods and if nobody comes out...opens the door..closes the door..then starts the motor..they have no time to escape. I'll say it again..If your vehicle is running..you should be in it.Helluva price to pay for nothing more than a personal convenience. Just my humble experience as a professional mechanic for over 45 years..