I have tried many foot files, worst one I ever tried was probably the 'ped egg'. I treat myself to pedicures every other month or so, but still have lots of callouses. So I need something I can just grab and do the job quickly in between pedi's. The Microplane foot file works best on dry feet it says, and I have to agree, it works wonders on my feet. Just a few minutes per foot and my feet feel smoother and I have less callouses. Highly recommend!