I like them! I love the wear on the granite stair treads.............tells the story of life and time. Used to see that on old Glasgow Tenement stairs on the bottom sets. Generations of kids and families, men with tackity boots going up and down for a hundred years. Sometimes 50mm of Granolithic worn from the centres.
Sandstone actually. The wear is much greater and they are deadly with carpet on
We had many a fall in the first few weeks in our home that had them till I ripped it up.