No. I just set it up while it was raining and didn't get any delays yet, but I don't water for a few more days.
My rain sensor has threshold settings for when it trips. It would be good to know when the sensor trips to adjust it.
Also I imagine rain delay notifications are based on both the sensor AND location weather data. Without breaking out the continuity tester it would be nice to know the status of the sensor and how it is functioning. Rather than taking it on faith that it is doing something.