I don't know about the emery board part, but what I do know is that cats scratch stuff to mark territory. They like tall things they can stretch up as far as possible leave a mark in -- like the side of your couch and tall scratching posts -- so they can let everyone who approaches or comes into the territory know that a big, tall, strong kitty lives there. They'll also tend to do a quick claw of a small area of carpet to mark territory from scent glands in their paws.
So, it strikes me that, unless the cat perceives the horizontal thing on the floor as an area to mark, they wouldn't take an interest in it. Or, they may take an interest once, but not repeatedly. If the surface of the thing actually dulls claws, that would be cool (although cutting Bean's claws is no big deal for either of us) but to encourage the cat to want to return to the thing again and again, I would think it would have to be a part of a tall post. At least, that's what I know of cat behaviour and trying to get cats to claw horizontal things and teaching cats what stuff in the house they can claw to be all territorial with and what not.
I'd be interested to hear if anyone got one of these things and their cat is interested in it regularly.