The indicator works great. It does exactly what it is supposed to do. I rely on it, but not as a replacement for general maintenance checks.

Look at it this way.... if it hadn't come on you would have been replacing tires much earlier while continuing to spend more on fuel. With $300 a piece tires you need to be doing regular checks on treadwear, as well as pressure checks on at least a seasonal basis. The monitor won't tell you if your alignment is bad, a wheel is out of balance or if the tires are overinflated so you need to get down there and look!