I love the performance of the floor. It warms as expected, and the thermostat adds a nice touch for warming the floor for the times I plan to use it. However the construction of the mats has a weakness. The mesh used to attach the mats to the floor joists can pull loose from the foil if the coiled wire is left hanging too long before hooking up the wiring. It seems that only the adhesive on the foil backing hold the mesh. I was able to repair the mats with a combination of foil tape and strips of wood to hold the mats up. I do appreciate the help I got from technical support at Watts Water.