Does anyone amongst us have advice, experience or opinions on aftermarket tire pressure monitoring systems? Our regular vehicles (car, truck) were made before TPMS came along, so the only experience I've had with them were on a rental car. (When the idiot light came on, it looked to me like someone's backside seated on a slatted sauna bench. Took awhile to figure out it was was showing a tire going flat.) Has anyone found them at all useful? Thanks in advance for your reply.