Apparatus small, ergonomic and good design, it must, however, take the "coup" to use, ie, do not press too hard. After a few minutes of use, it appears to be effective and meets my expectations. And I can even talk about that I'm used to daily care nurse for almost 2 years! After using several kinds of hand files specific to this kind of care, he, in minutes, fully satisfied! Moreover, it does not hurt that is a significant advantage .... in short, and subject to prolonged use, this device seems to me perfect! :-)