We were planning to use this indoors, for the cats (there are 2 of them) to play in. As it turns out, the cats don't like going inside it at all, but at least one of them likes to hang out on the roof (which has a scratchy, black sandpaper-like surface). The cat who likes to go on the roof is overweight, and after a couple of weeks, one of the ledges (which he uses to jump up to the top) broke off, due to his weight. I was able to fix it by drilling some new holes and placing some new screws. So why so high a rating? Well, it looks nice, and as it turns out, we're getting some unexpected use, as our 10 year-old daughter is using it as a playhouse, and she's in there all the time, making crafts, decorating it, and just hanging out. So I guess it worked out, even though it's not how we initially intended it to be.