Product review (5 stars): Great component, not a complete solution though.
Just to be clear, this works great and I'm very happy. I only wanted to point out that the image showing the electrical plugs includes additional material. All that is included is the black box and temperature probe; you will need the wires, converter to 3-prong plug, the outlet box, etc...

There was some feedback about the instructions referencing bridging the neutral instead of the hot; the version I recieved corrected this suggesting to bridge the hot.

The only complaint I have is with the connectors. Particularly the connector to power the controller is small (too small to get two 12-gauge wires inside). The connectors for device 1 and 2 are larger, and can support two 12-gauge wires. This is only an issue since the diagram recommends connecting the hot and bridging then to the other two; I found the reverse to be more practical. If you're planning to use wire-nuts its not really an issue though.