I've seen some of these that have a preset temp in then and some with wafers. Is there any difference between a large picture window and like a regular one with the 2 small windows? This is one thats going to be used for hatching chicks that 4-Hers want hatched. Right now I have a LG still airs and I've done pretty good with it but want a circulated air one since I've heard some great stuff about them. I was looking at this site since they had some on sale for a good price (In my head atleast) http://www.surehatch.com/GQF-Table-Top-Egg-Incubators.htm What one would you go with?