I haven't seen any other of these so I thought I'd post.
I picked this up from a fellow home brewer getting out of the game. It was given to him / or he found it. When plugged in, it ran constantly and turned the water bath into a slushy so I wired in an adjustable thermostat. I cleaned up the outside and painted it with chalkboard paint to class up the operation a bit.
From what I can tell there this about 50 feet of 1/4 inch stainless steel in 2 gallons of water. I set the thermostat to 1.5c. My thermo runs the compressor until it gets to .5, then won't kick on until the temperature has drifted to 2.5c. It takes about 1 minute per degree Celsius to chill. After I added some insulation, I only lose 1c every 2 hours! So the compressor only kicks on about once every two hours
I added 10ft of 3/16 bev tubing from my room temperature keg to get to the unit. It's been pouring well, albiet slowly, with this setup. I've upped it to 25 psi to see how that looks. I'd like to carbonate a saison but fear it might be too much psi for the tubing. I figure a longer tube would remedy the situation. I'll report back.