After using this nail filer o will never go back to my old one. It filed my nails fast and made them so even. I hate when I use a filer and it makes my nails look sideways.

So there is not much differentiation there could be on nail filers, in my opinion. Except, the times I foolishly got them at dollar stores and found my nail were filing the filer instead of the other way around! Well leaving aside cases like those, drug store brand nail filers will do the job. Bonus to Revlon for not overcharging this product!