Product review (4 stars): Works well enough to convert a freezer to a refrigerator ...
It works well enough to convert a freezer to special purpose refrigerator.  I needed it to maintain a fairly narrow temperature range between 31 and 34 degree Fahrenheit and it does just that.  However, you have to initially play with the temperature setting to achieve your desired temperature range.  It is about 7 degrees off.  In order to get the freezer to 32 degrees, my unit had to be set at 25 degrees.  But once set, it maintains the 7 degree plus temp. setting very consistently.  The thermometer looks somewhat fragile but as long as you don't repeatedly bend it or move it, it should be fine.  I set mine slightly offset from the freezer wall, halfway down.