The cat scratch furniture protectors are great!
Flexible and very easy to apply. The adhesive sticks well on the furniture. I tested them on a small area to see if they leave glue residue behind - glad to say: they passed the test.
Pro tip: put a scratching post by where you applied the cat scratch furniture protectors . Your cat will scratch the scratching post instead. In case he changes his mind, the scratch furniture protector is there to protect the couch from cat scratching. Great product and fair price.

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 If you do not have time to train your cat and you want to protect your furniture, this is a very fast solution. The sheets come in 10 x 17 inch size, so it is a rather large size to fit easily across the back of a chair or on a carpeted step. Yes, you can still see it even though it is sheer. But it does a very good job. Also, it is so thick the cats will NOT be able to get claws into it at all. It is solid. I tested several surfaces and feel confident about the glue not leaving a mess if I removed in the future. The only frustration I had was removing the backing. If you cut a small area on the edge to get it going, it was fine. I will buy more for several fabric chairs.

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This product is easy to apply to my furniture. It does stop my cat from scratching in all the places that I've placed these protective sheets. It's saving my expensive couch from further damage. It sticks best to flat surfaces on the furniture. If it's a rounded surface, the edges can pop up, but it still works fine! Great product overall.

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EDIT: Seller reached out with stellar customer service and offered a replacement.

Let me start this by saying I DEEP cleaned my couches first. These things just didn't stick. I even tried this on a brand new, out of the box, faux-leather seat, and these things just wouldn't stick to save their lives. This is the worst because now my cat has an adhesive addiction and licks all the corners that are coming up.

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The vinyl sheets are clear, thin and flexible. Sticks well on the furniture. You almost can’t see them.
Easy to install. Our cat occasionally looks at them for a while then moves along.
The scratch guards are inexpensive considering the price I paid for the new sofa. Big thumbs up