Bought these as I have wood floors. They didn't feel any different from the stock casters on the chair so I was worried and was planning to buy a floor mat, but it's been several weeks of constant use now (12+ hours a day) and I have not yet noticed any scratches on the floor.
Bought 1/4 inch tempered glass chairmat. My Fern's Haworth two-tone wheels were fashionable but rolled just too easily on the glass. The rubberized wheels slow this rolling-off-the-mark down considerably.
Zody chair is rolling smoothly. Shipping was quick.
Old casters came out easy, new ones were easy to install. These casters are much nicer on our tile floor office, wouldn't mind if they were a little softer
I bought the Zody casters. They are definitely a step up from the hard casters but still roll pretty easily on my wood floors. It could be a bit better.