Yes the monitors work and the sensors are in the valve stems. You can see were the sensor is when you take off the tire. normal valve stems have a small round rubber ball, looking thing holding the stem on. This is a larger square box like thing. The only problem, sort of, is every Spring and fall you are going to have to take the tire off the rims and mount the others on. Depending are where you are, it might cost $25 per tire per swap. Also make sure the tire guy is good so he doesn't damage the rims or the tire mounting them that many times. So far they aren't bad in the little bit of snow we're having. In the dry, cold days, the handling isn't as good as the pilots, but that is expected. They are better than I thought they would be.