I have an LG with the turner and I added an old computer fan to move the air around. The temp changes a little bit but not by more than a couple degrees. I used to worry about it and adjust it a few times a day but now I check it once a day and if it is at 98, I give it a tiny tweak up and if it is at 101, a tiny tweak down. After touching the dial, I walk away until the next day. Sometimes I go a few days to a week without touching it. I don't monitor the humidity at all, I just add water to the wells when empty. My hatch rate is about 65%. I'm only hatching eggs from birds I own when I have too many eggs to eat or sell so there is no major cost for the eggs. I suppose if I was hatching rare or expensive eggs, I would upgrade because this thing is a piece of junk...but it does work for me 65% of the time and it meets my current needs.