I've used the styrofoam ones with a decent amount of success. I have an old Farm Master that will hold 500 eggs and works well. I just don't have any desire to hatch that many chicks in a season, much less at one time.
I'll let you know how this one works out. Gonna start a test hatch this weekend with some Cream Legbars, some Sebrights and some OEGB.
Edited by jophus - 3/4/16 at 9:00am