@sleaver, just following up on your post in more detail:
The Iro is an ET based controller that automatically adjusts irrigation in response to changes in pant watering needs. Our Water Budgeting feature, available on fixed schedules, will adjust the watering duration on a weekly basis. Flex schedules, coming in our 2.0 release, will adjust the watering frequency on a daily basis within the allowed days set by the user. Watering durations are not adjusted on Flex Schedules.
The Iro supports all major rain sensors. Additionally, the Iro comes with a built in Virtual Rain Sensor via it's Weather Intelligence feature.
Being EPA WaterSense certified makes the Iro eligible for rebates in nearly every state. Sometimes for 100% of the purchase cost. For details, please see this support article.
Hope this helps! Just curious, how did you learn about Rachio?