I set 25 eggs (mix of OE and Welsummers) and got a 89% hatch rate. I had three at the end that didn't pip. One not fertile, one late quiter guessing around day 18 and one dead in the shell wrong way round with no internal pip. Not sure what happened there......my humidity was good. I have a mixed batch of eggs to go in a bit later this week with a number of different breeds. That will be fun.