We have on and it works ok. We were in Sturgis at the rally and hosting a margarita night when a storm came up and and before the sensor or us could get it in, the awning blew almost over the motorhome. No damage but I guess the lesson is that they might not work fast enough all the time.
Like the guy said in our orientation on rain sensing fans, the have to get rain in them first, so your floor is going to get wet. His other advice was never leave the awning out if you leave, go to sleep etc. That was the number one reason they replaced awnings!
Good adivce.