"The only furniture our cats ever want to scratch is our couch, and even then they only clawed the corners of the couch. I put this tape on the corners almost two years ago, and they haven't tried to claw the couch since! They didn't even figure out that they could still claw the exposed material next to the tape -- so either they only like clawing corners, or they're not very smart!
Even though the tape is clear, it is still visible since it's shiny, and if the cat rubs against it (which ours don't) I'm sure it will attract hair and dust. Our couch is a tan color so dust doesn't show up much on the tape. You can also not use the tape on some surfaces, such as leather (just read the instructions first). Overall though, these are pretty minor issues considering it's saving our couch!
It should probably go without saying that you should also give your cat a good alternative place to scratch, like a good scratching post or cat furniture. (We have a scratching post near our couch that's half sisal and half carpet, and our cats cannot walk past the post without stopping to scratch!)"