I have the first one you indicated. I have my first hatch in there now, eggs showing veining. Despite being fan forced, there is a variation in temperature from top to bottom, so you need to have your thermometer (not included) at egg level. I have put in two one litre bottles of water, with the eggs between them, and it now holds its temperature within half a degree Celsius. It was all over the place without the bottles of water. These are in addition to the water in the well to add humidity. I bought it from people down the road who have hatched out over 200 chicks in theirs in a very short time. They had to put theirs in a cupboard to stabilise the temperature, but did very much better after that. If you put it in a room with a stable temperature I believe you can have success with it, and it is easier to clean than a styrofoam surface.