Overall I was very impressed with this incubator during my first hatch. 6/7 eggs were fertile and all 6 hatched between Day 21 and Day 22, even though I had accidentally set the cooling feature on before Day 7. The design is fairly good, but I almost had the last chick get its head between the reservoir and fan as I was removing a fluffy one that had been in there for a while. Thankfully I noticed its quick movement into this dangerous area before bringing the lid down the rest of the way. Overall excellent and easy to use.