The Porlex is expensive for what you get. It used to be cheaper. The Rhinowares grinder is very similar and still cheap. Stainless steel 34mm burrs also cut si

The Porlex is expensive for what you get. It used to be cheaper. The Rhinowares grinder is very similar and still cheap. Stainless steel 34mm burrs also cut significantly faster and more consistently in a similarly sized grinder. This is the main reason you want stainless steel. I wouldn't worry about longevity since we're talking about a decade or more for whatever type you chose. But yes, ceramic will last longer. In fact if you don't want the grinder to fit in the plunger of an aeropress, you can get Taiwanese grinders with stainless steel burrs, well stabilised shafts, ball bearings, a milled Al body for less than the Porlex mini and only slightly more than a Rhinowares.