Review (3/5): It also works better if you have soaked your feet for a bit ...
This was a little bit taken back in experiencing the way this works because I have never used a motorized file and to me, it seemed temperamental. You can't press down or the rotation stops, so you have to apply it gently and with a light handed touch. (I guess it is just a matter to getting used to how to use this.) Perhaps this is the way due to safety - it lessens the possibility of deep or severe abrasions? Or Maybe that is just the physics of friction and a safety feature.
Applying it gently and lightly is the key. It also works better if you have soaked your feet for a bit to soften thick callused areas. At that point though, when you use this device after soaking, be sure to not leave it on a section for more than a few seconds per pass. Definitely use a foot moisturizer after use, by doing so, the areas I treated were softer and smoother.
It DOES work, but it will take a few uses to truly get rid of thick calluses- it does smooth them and diminish the size, but certainly, it does not rid them in one treatment. The first time I used it on my feet, I only had about five minutes to do this, and it did remove some dead skin (not all) and smoothed out calluses. My guess is that with repeated use (as in two or three times a week), the appearance of my feet will be better and softer. It is better than a pumice stone mechanized by your hand as the effort is less with a motorized device. The roller on this device is akin to a pumice stone, so the roller not flimsy. I have not tried other ones like this to compare this to them. This model package came with an additional roller AND batteries. Keep the clear cover for the roller - for more hygienic storage. It is waterproof, so the roller was easy to wash off between uses.
I might update this after a few more treatments. Overall, I am not disappointed - the price is better than the others, the roller is decent, and I guess I was hoping it would rid of calluses in one treatment.