My cats might just be bad.
We have a HUGE scratching tree on the main level of our house and right beside it is a little ottoman with their food dishes on top. The ottoman is destroyed. You can see the quick in most of their nails so we're able to keep them fairly short too.
Thankfully they've left our couches alone for the most part. I bought Odie a little couch for Christmas and one of our cats has left it alone but I've caught the other scratching it a few times.
I've used the feliway pheromone plug in before to help de-stress our one cat when we moved and I might use it again when we get our new couch.
When Odie was a puppy she chewed a tiny hole in the couch and we used the bitter apple spray and it worked wonders. She never tried chewing it again.