Bests & Worsts Reviews from Amazon

I ordered this without doing enough research. The tire sensor threads on this product are made of a material that reacts with your tires' valve stems. Many customers have had to had their valve stems removed and replaced because the sensors become impossible to remove without destroying the stems. Nonda knows of this problem but continues to sell the product. There are other issues as well: Nonda says on their website (but not in the product literature or printed manual) that you need to remove and lubricate these sensors every *two weeks* to keep them from sticking. Also, Nonda recommends that you drive the car for at least ten minutes at 14mph (22kph) or more every time you go anywhere before you can trust the data - this gives the system time to calibrate. The manual says this driving time can be a troubleshooting step, but in fact they have told me that this is needed every time you start the car. The product literature says these provide "real-time" information, but if you have to drive for several minutes every time you go someplace, that is not "real time." I just bought these things from Amazon and was going through troubleshooting steps with their tech support when I came across this disturbing information. I am returning all my Nonda purchases. Nonda has admitted in its online forums, and in in an email to me, that this is a design flaw and they are working on a new version. Shame on Nonda for selling a product they know to be faulty.