Review (4/5): Caution: Can cause itchiness in skin on side/top of feet
It worked fairly well, I followed the instructions and, other than my heels, my skin exfoliated and felt baby-smooth. The top and sides of my feet were irritated and itchy a few days after applying, and this lasted two weeks.
Since I still have some tough heels (they recommend using again after giving your skin a break) - I'm doing a second treatment. BUT, this time, instead of using the socks/booties as designed, I extracted all the liquid from the booties into a shallow plastic container. I mostly want my heels treated, so I have the container tilted up so the liquid is not touching the tops/sides of my feet (there's not much to extract) - and just my heels and some of the rest of my soles. I covered the container and my feet with saran wrap to keep things moist over the 1-2h treatment.
Will try to remember to update after this approach.