painful callous' and have grown tired of using a callous ...
This is VERY POWERFUL.  After reading all of the other reviews, I knew to be careful when I first started using it but have been quite surprised at how strong it really is.  There is a knob that allows you to slow it down, but even at it's slowest it is dangerous.  I have many thick, painful callous' and have grown tired of using a callous shaver, so sought this as an option.  Even when using the slow speed, I have hit skin and had it sting.  No blood so far, but it would be easy to do.  I cannot imagine a professional using this.  I kind of skim each callous lightly as I go.  It does smooth them out so it does what it says it will do.  But, please, be careful using it!!!
Rating: 3 stars