Hi Bryan, I have Sense detection working pretty well for both my AC units, upstairs and downstairs, plus also have them instrumented via my Ecobees and HS110s on the air handlers for each. My experience is that Sense detection does miss some detentions both at the start and the end of the cooling season.
Here’s a view from Home Assistant of my AC power usage for my upstairs unit on top - blue is air handler, purple is compressor / AC. The bottom show what the Ecobee is doing - the blue bars represent cooling cycles. Notice that there are a few blue bars on the top that don’t have matching purple bars - those are missed AC detection cycles. Not many when AC is running fairly regularly, but missing purple bars when the run cycles get more sparse.
