Smells awful, Works well!
There are feral cats who sometimes come to my terrace to visit my patio furniture and stroll around.  I have been spraying regularly: at first, every night and after a couple of weeks, am down to every few days.  It clearly works, as I have a motion detector/video camera that tells me if the cats have visited me.  I know it works, because when I forgot to spray on schedule, my motion detector/video caught the visitors. It does smell awful, but it's worth it to keep away these unwanted "neighbors!"
Rating: 5 stars