It’s more of a first impression than anything, since I’ve owned them for a day so far.
The wheels are pretty smooth, rolls pretty good. I found them to be a bit noisy, compared to Oaks RV2V. The material is special. It has a slight grip on some surfaces and it would be slick on others. They probably feel more like plastic wheels. However, I have to admit that I’ve never had FF wheels or Winkler wheels. So as far as good plastic wheels go, I am completely clueless.