I have a knock off. But it kept temps very steady, humidy too. I used a separate thermometer Hygrometer with probe as the readings on the unit itself were off, so I set it completey by what my Accu-check told me the temps and humidity were.
I still had trouble with my hatch, Had to assist several chicks (who all survived) and Had several dead in shell with no internal pip.
Thinking I possibly had humidity too high for first 18 days. I am in Michigan maybe I should try no water for first 18 days?
What bothers me is If it holds a steady (and correct) temp, the turner works and the humidity is correct it should work as well as any other incubator...knock off or not.... but I had better hatch rate with a cooler, a computer fan, a light bulb, a horrible water heater thermostat that kept spiking to 104 and hand turning....just doesn't make sense.