We had the Doran TPMS for years and recently changed over to the TST system. We love the TST as it seems to work much better than the Doran. Not knocking the Doran system as it worked great when it was new, but as it got older we started losing contact with sensors. I will say the customer service was great with Doran as they took care of any issues we had. The reason we changed is the receiver just quit working on the Doran. We got the TST because the receiver is wireless and they have sensors that you can change the batteries if needed yourself instead of having to buy a new sensor, and the TST offers a 'pass through' sensor that you can add air to the tire without having to remove the sensor. Hope this helps.