I have also had not so good results too. I tried it on myself and it was brilliant but on others it's not been so good. I don't want to hype it up to clients if its not going to be impressive!Now, I am going to put a slight downer on this thread I'm sure but in the name of a balanced thread here goes!
I tried Callus peel on my Mother, after reading the other "Callus Peel" thread that went on forever and I was so excited to try it. I didn't get any where near the result I was hoping for, I was realistic in my expectations as my Mother does have extremely dry feet but I felt I made more difference with the filing than anything AND I had left it on for even more time than recommended!
I have done it on here twice and had the same result both times, not I just have a load of kit sat in my cupboard doing nothing.
I may have anosey on Youtube and see whether I think I should dig it out again, just in time for "summer"!
Just have to establish some prices...