I've used a lot of such products on cracked heel skin but this is definitely the best one. Even though it comes with refills, I haven't had to switch it out yet, it is durable and adheres well to the metal, unlike cheap files. The metal handle and abrasive surface area are big enough to be easily handled and manoeuvred, is sturdy, saves a lot of time. You have to use it on dried skin.
My cracked heels disappeared when I coupled this with regular foot soaks containing French/European green clay (sold on iherb, Frontier and NOW both carry this). After you no longer have cracked heels, continue the regular (maybe 1x a week, depending on your need) green clay foot soaks and maintain the softness of the skin with a pumice stone (also sold on iherb, try the Denco brand one, supposed to last a lifetime; other bath accessories brands have this too). Then you can semi-retire this foot file which you need only when the cracked heel situation needs urgent attention.
Hope this review helps!
