I have a Janoel 48 and after a few weeks of testing temp and humidity! I hatched my first batch with no issues. I know some have had trouble with them vut mine ran flawlessly. Think it is about testing,testing,testing and seeing what the ranges are on your particular brand.
So excited! After a lot of comparing, getting people's opinions and really being serious about our goals with chickens I Just bought a Janoel 48. Had good and not so good reviews but I discovered that is the case with most brands. Now the long wait til it arrives then the fun really begins...