It works - not a miracle fix, but improvement!d
I never had the cordless version, so cannot compare, but others claim the corded is more powerful.  But this seems really effective for me.  One treatment takes about 10 minutes to do both feet, but will leave them feel smooth and pretty for about a week.  At this point I have not been good about doing it every week, so I have never completely smoothed out my cracked heels, but I feel it is possible if I just stick to it.  Also, I went and bought the extra course refills, which worked even better.
Rating: 4 stars