Purchased August 2015. I was driving on a dual carriageway when the TPMS alarm went off. The front tire on the passenger side quickly lost air. I pulled off the freeway and found an empty parking lot to change my tire. The TPMS system prevented serious tire damage and possibly an accident. I am very comfortable. The problem with the tire was a broken valve stem. I didn't have a metal valve stem as recommended by the TPMS manufacturer. I replaced the bars on all tires with metal bars.