Some people really dislike the old fashioned metal nail files like these and while I get the use for a more disposable kind, especially for salons and places where they are used on multiple people. Although I am told these can sanitized just like barber tools, I'm not sure I'd want one used on others used on me. The crystal/diamond surface makes it feel like they are almost pourous, even though logically I know that isn't the case, they just have too many books and crannies for me to be comfortable sharing. That being said however, when it's just me using it personally I'm my own home, I'm I'm love with this. It works great for thicker nails on the toes and the tiny pointed end helps you get into corners and edges to prevent Indian toenails. Also good for thinning out acrylic on a nail or fill that looked good in the salon but once home you realized might be a little thicker than you'd like. I thought it might get duller with each use, especially when used with things like acrylic that have lots of powdery fallout, but it hasn't seemed to change or full much at all after almost two full years of use. Will definitely repurchase when a new one is needed.