Following a tire blowing out on me when I was on the motorway, it left me wary of travelling long distances.
If you have an old vehicle that doesn't have a tire pressure display then this is ideal.
It works off solar and I have had no problem with it whatsoever.
I checked my tire pressure with 2 different gauges, one professional-grade digital gauge, and one well-reviewed analog gauge before mounting these for the first time. All three measurements two gauges and the TPMS system were within 1 psi for all tires, so I am satisfied with their accuracy. I am now confident that my tire pressures are correct and I will be warned of any problem.