Our vet recommended this little in addition to putting a second litter ...
926584
I was having trouble with my older cat peeing and pooping all over the kitchen floor.  Our vet recommended this little in addition to putting a second litter box in the area of where he was going to the bathroom.  We ended up using Nature's Miracle Disposable litter Box and this litter.  It has worked like a charm!  I went from having to wash the floor everyday, to maybe every other month and that is only because I moved the box, or he tried to use the box, but missed (he is very large and this happens sometimes!) This litter works great!
4165588
We catsat a friend's cat, who was awful at peeing on clothes. When my cat smelled the enzymes, she started peeing on dirty clothes as well. We had to retrain her to use the litterbox, and the litterbox only. I decided to by the Precious Cat Attract litter since it was 40lbs for a reasonable price. Worked instantly. She stopped peeing on clothes and started exclusively using the litter box again. Life. Saver.

It is a clumping litter, so it's a little dusty when you pour it in. But man does it clump strong! We switched to their normal litter line after we finished this bag.
10059
My kitten was peeing in places other than the litter box and I was on the verge of rehoming him. A friend recommended this litter so I figured it was worth a shot. He hasn't had any problems using the litter box since.
4664813
Would be nice to have a bit more pellets. To purchase more is really by far too pricy!
Otherwise it works. Our cat took a week or two to get used to it, but shes doing her thing now,
Its much easier to dump the soaked pad, replace it with another, and scoop the hardened pooh, than to try to get the clumping litter off the sides of the other litter box we used for her in the past.
Assembly was easy. Dont think more than one kitty could use this, bc it isn't very big. My opinion though.
Pad for urine is very absorbing and theres not a strong urine smell, but the pooh do need to be scooped often cause its not covered with any clumping litter nor sand to absorb the smell.
3905043
We give this product to our small DOGS once a day to help with the bowels.  It works great and our Veterinarian recommended it.
3398682
Need to mix with another litter,  then it's the best litter in the world
3202964
I occasionally foster kittens and this is perfect for those situations.  The pans are pretty small, so I don't think they would work for an adult cat.  There is also a correspondingly small amount of litter, so I had to change the pan much more frequently than the week it claims to last.

One of the major benefits to this is no litter dust from pouring new litter.  The dust from other litters sets off my allergies in a major way, and almost always triggers an asthma attack.  Since this has litter built in, I don't have that issue.

I also appreciate that these are made of recycled material, so I don't feel as wasteful as I otherwise would by using disposable litter pans.
3681885
I have 2 cats, and one caught on immediately once I started opening the hole (I highly recommend the extra smaller steps). The second cat was much more hesitant. She would rebel by not going to the bathroom for a few days, even had a couple accidents. Using a few tricks, like positive encouragement by placing her on the toilet when she really needs to go, treats after she went, and not yelling when she messed up, and she too eventually caught on. The steps were always a little more difficult for her and the rebellion would start again only temporally. Just be patient, go slow, and LOVE your kitty! You will be thanking for never having to scoop litter again!
1549634
We were forcing pills down the throat of our poor cat, who will be taking a pill twice daily for the rest of his life. Now with these pill pockets, he thinks he is getting a treat! His pills are small, so we even use half of a pill pocket to coat his pill, making these last twice as long. They are not stinky. I wish they cost a bit less, but it has made our lives and that of our cat so much easier!
4559519
We use this for two reasons:
First: My partner and I foster cats that have come from bad situations. Most times they will reject a quality food and prefer a very low quality food like Meow MIx or Friskies canned food. It's especially hard for us to feed a low quality food to a pregnant or nursing momma cat, but we found this was a nice addition to their food. I feel they are getting more nutrients that they would otherwise lack in their prefered foods.

Second: While we feed our cats primarily raw food, we don't feel this is needed & can actually be harmful if they receive too many supplements, however they are not avid water drinkers, especially in the warmer months. We fill a couple dishes with a small amount of cold purified water once a day and sprinkle a tiny amount of this over the water and they drink it right up. We feel better that they receive a little extra hydration for the day.
4161147
I love this and believe both cats are reaping benefits, although I specifically bought it for my 6-year old cat.  My 6-year old cat has irregular bouts of fresh blood in his bowel movements since he was first diagnosed and treated for roundworm three years ago.  The roundworm cleared up, but not the bleeding.  It may be unrelated and his vet doesn't seem concerned since as it could be due to stress or other "benign" causes.

I had been giving Fluffy Purina Fortiflora probiotic packets in the past and this is also what his new vet prescribed last year.  However, this past winter, I read that foods and meds with "animal digest" were not the best for cats, so I started looking into a new probiotic.  It was between this one and another one and I decided to try it first.  I don't need to try the other probiotic.  The results of using this one all winter long have shown less frequent bleeding and much shorter periods of blood in the stool - now just a day or two.

Fluffy is a feral cat that lived on the streets of Chicago for three years.  I had "TNR'd" him as part of my registered feral cat caretaker duties and decided to lure him inside before I moved as he was the last one of a bunch still coming.  So before he became a full-time inside feral, I can't really say if he had more than worms.  I now suspect he may have FHV (not to be confused with FIV) and that this probiotic is addressing his immune system and providing good bacteria.

The probiotics have definitely helped Fluffy's bowel movements, as he has become more constipated in the last year or two with only wanting dry food.  I grow organic wheatgrass for the cats and this helped some, but the probiotic was a good add-on for that issue.

It is also less expensive than the Purina and the powder mixes well with pureed and wet food.  Now that he has fewer bleeding issues, I just maintain him and my other cat (a younger feral we adopted from a shelter who had him in a cage for nearly six months) by giving them probiotics every other day.  Captain Billy will eat anything and goes crazy for wet food.  Fluffy is very picky and it is impossible to give him meds other than by sneaking it into his food.  This odorless powder is a godsend.  I mix it into Gerber Chicken baby food (nothing but meat, water & cornstarch) and then add a little water.  Each cat gets less than an ounce of baby food with the powder every other day or they would both be "roly poly".
814222
Recommended by our vet for a cat with touchy tummy.  Not sure they really help but he does seem to be spitting up a bit less often.  The thing that really worked -- big time -- was to cut his nightly FF wet food in HALF.
1941553
Our veterinarian has prescribed this a couple times when one of the cats have been sick.  We decided just to keep our three cats on it daily.  What a difference it has made!
4881517
Just what our growing cat needed it seems.  We adopted a stray kitten recently, and I noticed that she seemed on the skinny side, even though I bought a couple of different kinds of premium dry kibble since she didn't seem to be crazy about her food.

I really did not want to get into giving her wet at all, but thought I would try this to see what would happen.

The first time I put it down for her, she wolfed it down like she had not eaten for weeks.  I could literally see the difference in two days, that she was heavier, and actually had a tiny bit of a tummy (whereas before she seemed on the too skinny side to me.

Not saying that any other wet brand would not have done this (I think it would have had same effect), but I have used Nutro for my now senior dog for 13 years, and he's always seemed to like it.

Seems to be a good choice for both!

First few ingredients listed are also right in line with the recommended (as are the canine formulas), so I am happy.  Perfect sized can, too.
4858859
I know the subject of whether or not pets need probiotics is controversial since their digestive tract is very different from humans, but we've had success using probiotics with our cats so I thought I'd give this a try for our dog.  It contains a good range of probiotics and nutrients including:
L. Acidophilus
L. Casei
P. Pentosaceus
L. Plantarum
B. Bifidum
Inulin
Glucosamine
Chondroitin
other ingredients that Amazon covered up with their UPC code sticker  : (

Pros:
Great mix of vitamins and probiotics
Glucosamine and Chondroitin are recommended for many breeds, including our Sheltie to help with joint issues
Convenient powder that can be mixed with dog/cat food (it says wet or dry but there is no way my dog would eat it on dry food.)

Cons:
Small scoop makes dosing difficult for dogs under 50 lb. and cats (It says to give dogs under 50lb 1/2 scoop and small cats get a 1/4 scoop while larger cats get 1/2 scoop.)  The scoop is small and hard to measure a half or quarter so I just mixed a whole scoop into a can of dog food and split the can over two days. It would have been a lot more convenient, though, if they either gave dosages in standard measurements (i.e. 1/8 tsp./day) or included a smaller scoop. Larger dogs could then have 2 scoops a day instead of those of us with smaller dogs trying to get measure half a scoop.

I'll update this if I see any beneficial results in our dog or his medical conditions.

Update 7/23/16: I have not noticed any beneficial changes with my dog. My dog is pretty healthy, though, so I think it may be more worth trying on a pet with digestive issues. You may be able to see a bigger difference. I'm still giving it four stars, though, because the list of probiotics is so comprehensive that it should, theoretically at least, help a pet with digestive issues.
4438897
Our cat really likes to make sure the smell EVERYWHERE is covered. Since she developed a disliking for her covered litter box, we were looking for an open litter box that would keep the litter where it is supposed to be. The Two Meows litter box does an admirable job considering that it is open. We would still advise to get a tracking mat that extends on all potential entry/exits sides but otherwise highly recommend this litter box.
1533996
My Nature's Miracle automated litter box wore out after one year's use, so I decided to try the Omega Paw.  It took a little getting used to, but I've been very pleased with the results.  I'm glad I got the large box, as my cat isn't very competent in using smaller boxes.  To help him transition, I left the lid and screen off for a few days, and once he was familiar with his new box, I installed the lid and screen.  Another tip:  Use a couple strips of duct tape to secure the screen to the inside floor of the box.  If you don't, the screen tends to pop out of the brackets.  I also use small pieces of duct tape as "insurance" alongside the tabs that connect the lid to the base.  As you see from other reviews, the cheap plastic tabs are the main deficiency with the Omega Paw.  They would be wise to put better tabs on it, even if it costs a couple bucks more.  I've been using Arm & Hammer "Clump & Seal" litter, so there's virtually no odor or dust coming from the box.  Now that my little "system" is in place, I find it to be much easier and cleaner than my expensive "automatic" box ever was.  And most important, the cat likes it.  Hooray!