I am the owner of several cats, and when I bought one of these on a whim, I expected the cats to either be crazy about it instantly, and then lose interest, or be typical cats and play with the bag it came in and ignore the Crinkle Cave completely. Well, 3 months later and I am still amazed by how much use this thing gets! I had to buy two more. My only complaint about them is that when the makers called it a "Crinkle Cave", they aren't lying. They are rather noisy. I've had to remove them from my bedroom because, as cats are prone to doing, they become most active in their Crinkle Caves at the worst hours - 3 AM is the BEST time for Crinkle Cave play time! The cats love to curl up inside the Crinkle Cave and lie in wait for another cat to come by and then ambush them. All in all, a great gift for your feline pals. They'll have a blast with the Crinkle Cave... but I wouldn't recommend putting them in your bedroom if you're a light sleeper!