I've had the TST TPMS for a few years now and am very happy with it. The cost was right and the sensors have worked great. The only problem I had was corrosion on my valve stems of my truck due to keeping them installed year-round. TST replaced the 4 sensors free of charge, and advised me to use dielectric grease on the new set. All good from there.
If you've ever wanted peace of mind when traveling, get these! Sort of like setting your alarm clock and phone alarm because you have an important meeting in the morning - better safe than sorry. A travel friend also has the TST TPMS and had a warning go off to alert of a flat tire before it came apart to do any damage to his 5W.
I have the head unit velcro'd on my console in a tactful and inconspicuous location. Turning it on and letting it sync w/ the sensors is part of my regular routine.