i have the same thing basically from big apple supplies. their are many different types but they are all the same thing. i havent used it for eggs yet but i plugged it in for a week and it worked pretty good. the top stayed at 89 and if it dropped by 1 then it turned on again. the bottom is usually 1-2 degrees cooler tho. im trying to put a small fan inside to see if that will work. its only big enough for 2 small clutches, maybe a third. but for something you just plug in set and forget its not too bad. im gonna try Kemps incubator one day and build my own to see the difference