Product review (5 stars): Excellent device!
The device is working great, keeping a freezer at a stable 45F as a cooling chamber.  Wiring the thing with a heavy gauge wire was a bit of a challenge, as it is a kinda tight space in there... but got one stage happily functioning, which is all I needed.  If I need to use the second stage, I think investing in some short jumper wires and another electrical box will be needed.