Pedi Rasp quality BUT ....

This rasp is designed only advice I can give to make optimum use is to manually with a conventional grate grater large calluses (cracked feet and a thickness substantially horn) and then finish with this device.
If you use the smooth velvet once or twice a week, you will not have to use conventional grater because this device does very well the job.

This device provides comfort of use and finish (smooth skin) as manual grater does not bring it's very clear. Word feet sore from crevices !!
Certainly, I agree with some who say that the unit is noisy but you can not have everything.
Moreover, it is difficult to market a more powerful device, because some might be injured by heating ... (pro equipment is required and there is not at all the same cost)

In short, price / quality ratio that is well placed and quite effective provided the regularly and didnt expect to have a severe corneal layer.