Because it's so easy to use--just lather up and go!--I've been using it frequently and my legs are suuuuper smooth. Like, smoother than ever. Not sure that I see a difference in my KP personally, but I'm not going to complain because I can't stop rubbing my legs.
So yes, Salux. Definitely worth the $5, much recommend. Canadians, try lurking your local Japanese or Korean market for it, since it's twice as expensive if you buy online. I would never use this on my face because it is so abrasive, but it's great for getting baby-smooth everywhere else.
How do you scrub down in the shower?