After having worked with one of those styrofoam hatchers and getting lousy hatches -- anywhere from none to 3 out of 12, I decided to buy a Brinsea Mini Advance on recommendation of one of the people on this list. My first hatch just had 100% hatch. I had 7 eggs and my last chick hatched today! I had no shrink-wrap chicks despite the terribly low humidity here (less than 20%) and no hygrometer, by simply following the instructions. I'm putting in some new eggs tomorrow for my next hatch! I've heard some folks dislike this hatcher, but honestly, it worked exceedingly well for me.