Product review (4 stars): Watch it a few days to make sure it is ...
It has been working almost a year now with no problem.  However, I did have to adjust it initially with the internal screw.  I put the main adjustment at the mid point and then fine tuned it with the internal screw adjustment.  I had to leave the "pretty" plastic face plate off a few days (that covers the thermostat), so that I could access the adjustment screw.

I ended up putting my outdoor thermometer inside the freezer with the monitor on the dining room table.  Watch it a few days to make sure it is set just right and then leave it alone.  This is why the old thermostat died--  Changing the temperature too often.

Watch an online video on how to install first  -- Save some time.