Product review (2 stars): Worked well for just 1-year
Sadly, it only worked reliably for under 1-year, before it wouldn't always come on, and needed a smack when my refrigerator got warm...  I'm not unhappy with my purchase, as the appliance store wanted twice as much for the replacement part, I didn't know of any alternatives at the time, it single-handedly proved I didn't need to trash my whole refrigerator, and installation was drop-in simple and easy.

Like everyone else, when I first installed this part, my refrigerator was freezing even on the highest setting, but taking off the plastic knob exposes a hole next to the shaft with a tiny set-screw inside.  Just turn the regular dial to the center, then turn the set screw either way until the refrigerator suddenly shuts off, and you're perfectly calibrated, no trouble at all!  Not sure why that's so difficult for everyone else here.

When this replacement part failed, I already had a&nbsp;<a data-hook="product-link-linked" class="a-link-normal" href="/20-digital-general-purpose-electronic-heating-cooling-thermostat/dp/B008KVCPH2/ref=cm_cr_arp_d_rvw_txt?ie=UTF8">$20 digital general-purpose electronic heating/cooling thermostat</a>&nbsp;from another project, so I figured out it would physically fit, and started installing it in my again-dying refrigerator.  NOTE: Amazon also has&nbsp;<a data-hook="product-link-linked" class="a-link-normal" href="/a-nearly-as-good-and-Fahrenheit-version-now/dp/B00F05UI8O/ref=cm_cr_arp_d_rvw_txt?ie=UTF8">a nearly-as-good and Fahrenheit version now</a>.

Not having done it before, I spent a total of 3-hours testing, wiring, and lots of plastic cutting to get it installed.  It has worked for more than two years now, and gives me more useful information and precise control than this far more-expensive mechanical unit could. It even happens to give my 20 year-old refrigerator a super-high-tech look you can't get from any brand-new refrigerators.

I highly recommend going for the cheaper, all-digital option.  The extra installation work is a significant downside, but once you do it, if the digital thermostat ever fails, a new one will be just a drop-in replacement.  The controls are more complicated, but unlike a mechanical unit, you only ever need to adjust it once, then you can forget about it entirely as it just silently does its job.