LOL, I have to get used to what older people (my age!) fixate on. For me, if sprinkler running when it's supposed to all good. The tech from the company that installed ours came for our orientation, showed us everything was working, explained it, and how to change it. We actually enjoyed taking to her; she knew her stuff. Honestly, I've had a system like this before in Texas, so was a bit "in one ear, out the other," but the main point being if the grass is green, no standing water, not watering the road/drive/neighbor's yard/preserve/etc. all is fine. Watering in the rain is a waste of money because our yards are mostly sand, so added water doesn't do anything for our grass/plants and just flows through. Therefore, I love the rain sensor, but we were told they do wear out. Seasonal adjustments make sense because the watering needs are less in colder weather with less sunlight. I don't have experience with the Solar Sync component, but it does make sense. I'm pretty sure our new build only has the rain sensor, so maybe that is a tell. I would have thought by now there would be at least one retired Hydrologist provide a full summary of regional soil and water needs, tongue-in-cheek.

Solar Sync
 

I’m on DWilson’s side…so far.

I think the concept is that as temperatures rise and daylight increases during the summer, more irrigation is required. Conversely, less required in the winter. The Sync program takes into account the daylight hours, temperature and recent rains to reduce irrigation when it should not be needed. In addition, it can be ‘fine tuned’ by reducing the adjustment factor for your particular installation.

Of course, the other option is to keep a close eye on the soil moisture and make manual adjustments.

I agree that the concept is good, but I discovered that it just didn't work.