I know the OEM sensors can cost over 100 dollars each to replace when they go bad and on some cars the system even has to be reset when you rotate the tires (active systems)
the passive systems are more tolerant, but work off the wheel speed sensors for the abs and can also trigger an abs light if the tire loses pressure.....
I'm not a big fan of TPMS, its much simpler to just check air pressure every time you get gas