Rating: - It works but...
You have to rule out other things first. If your cat has an underlying medical condition that needs to be treated first or nothing will work. Most cats do not eliminate outside of the litterbox if they are healthy. In fact, over 90% of inappropriate elimination can be directly attributed to illness or a medical condition. The first step needs to be a visit to your vet for a urinalysis. Feliway is for the behavioral aspect. Once your cat is healthy again it may be habit to go in the spot where they chose. When a cat feels pain while urinating he begins to associate that pain with the litterbox itself. That's why they go somewhere else.

What Feliway does is mimics facial pheremones. Ever seen your cat rubbing his cheek on the wall? He is marking it to say it's a safe place. That's what Feliway mimics. Cats generally will not urinate where they facially mark.

As for my experience...I have a cat who has a stress-related bladder condition. He gets bacterial flare ups when he's under a lot of stress. Stress often triggers UTI, FLUTD flare ups, among other things. He is being treated for the medical side but still wants to go outside the box. I clean the areas where he goes on the floor with an enzyme cleaner then I spray with Feliway. As long as I'm consistent (spraying at least 2 times per day) he doesn't go there. I also use Comfort Zone diffusuers full-time. Yes, they are pricey but it is well worth it for me to have happy kitties.

Bottom line, this stuff works! It may not be the miracle you're hoping for and it may take a while but it does work. Like I said, you have to consider all factors though such as your cat's health and making sure you eliminate the underlying urine odor. There are products on the market specifically designed for cleaning cat urine. Use those because you may not smell the urine after using a common household cleaner but that doesn't mean your cat can't and until you get rid of that odor they will keep going in that spot.

Rating: - Sadly, it didn't work
I was hoping that this would be our miracle...it wasn't. Plugged in the device and used the spray, the next day my husband saw our cat peeing right next to the plug-in unit.

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Rating: - Great to stop marking
I have a cat with some serious issues when it comes to dominance and marking. After repeated incidents of spraying the couch when we introduced a new cat to the house, I was given Feliway by my vet to dissuade marking and control aggression. As for halting aggression, I haven't seen it do much around that issue, but with continued use, marking of the couch has stopped. I spray the couch each morning and each evening before going to bed, and the cat does not mark the couch when I routinely keep up with spraying Feliway. I did get lax on it for a few days, and sure enough - my boy marked the couch again. I will use this stuff as long as I have this cat! (and I hope that's a very long time!!)

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Rating: - Very good product, excellent company
I used the spray on carpeting where cats had marked, and there have been no further issues. Also, I have one very aggressive cat, and I sprayed a small amount of Feliway onto her fabric collar, allowed it to dry, and then placed the collar back on her neck. She became noticeably calmer immediately, and her attacks on the other cats decreased dramatically. This modified behavior continued for about three weeks, with an increase in aggression occurring now. Time for a reapplication apparently.

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Rating: - Totally Skeptical; Totally Won Over
Our boy cat was very anxious and was having political issues with our girl cat's strong fecal odor. He took it out on a very specific area of the living room where we always sit (the sofa and recliner). Within two days of applying this stuff, he stopped spraying. Within a week his attitude toward us and the other cat changed dramatically (friendlier to us, less submissive to her), and now a month later it's a brand new cat. It may not work for everybody, but boy it worked for us.