Product review (5 stars): Did Exactly What I Bought it For.
I bought 2 of these to turn some Frigidaire (FGCH25M8LW) chest freezers into refrigerators. It looked simple enough and I could not find any real evidence to suggest that this thermostat shutting off the power to the compressor was going to harm the life span of the freezer.

The one thing that I didn't do correctly (that in hindsight was fairly obvious) was that initially I left the gas filled sensor inside the freezer and ran the remaining 6 feet of copper tubing outside the freezer to the controller. I realized that was probably dumb as it would leave a significant surface area exposed to the outside temp that could skew the thermostat settings. OK, simple enough to fix. I just coiled the copper tubing back up, secured it to the inside of the freezer and mounted the controller to the outside leaving only a few inches of exposed copper which I insulated. Overkill? Maybe, but for that absurdly difficult change it's no longer a problem to with which to concern myself.

So if you are looking at one of these to make a freezer into a fridge, it was simple and so far (2 months as of this review) it's worked without any fiddling needed. I'm happy. Unrelated to the actual product but related to its use. I have had a freezer and "converted" fridge running though Kill-a-Watt meters for about a month. The Frigidaire freezer takes about 45 watts per hour to run at the factory set freezer temp. The modded fridge is set with the Johnson controller to 38F and run about 15 watts per hour.