Product review (5 stars): Just another replacement part you need from time to time
I don't know what's faulty by design - my dryer or the thermostat it uses, but I have to replace the thermostat about two times a year. I tend to blame the dryer's position relative to the air exhaust inlet on the wall - there is a sharp bend in the tubing pathway that may reduce its cross-sectional area, thus, creating an excessive resistance to the hot air flow, the sensor gets overheated and finally fry.
Anyway, taking into account the thermostat kit's relatively low cost, ease of installation, and availability, it's worth a five-star rating.