I put a dozen legbar eggs into the IncuView a few weeks ago. Three of them quit in the first week (blood rings) and the 9 that went into lockdown all hatched last night! I've had trouble in the past with chicks making it to lockdown and not hatching, or pipping and not zipping, and I believe it might have been low humidity. I was hatching in the winter, and going by the built-in hygrometer to determine when to add water. I think the thermostat is good but I no longer trust the hygrometer. I got a tiny combo hygrometer/thermometer from Avianweb on Amazon and it worked a charm.