I have the 20 and being a hatchaholic also, I forsee having to get a second one. I'm trying to space out my hatches for now so I can have one set brooding at a time. But incubating is so addicting!
One of the best parts about the EcoGlow for the hatch-a-holic is that you DON'T HAVE TO space out your hatches! The chicks who need the warmer temps under it will hang out there and the others won't.