Pros:
As expected from Gewa, the quality of this floor protection is excellent.
It does not stain the floor,
It is very robust
It grips to the floor as expected.
Cons:
If you are recording using a pick up, you may experience some noise coming from the friction of the rubber on the surface when the instrument naturally rotates back and forth on its own axis, when you are playing. In other words, a pick up can be sensitive enough to sense the friction of rubber on the floor, depending on the floor material. (rubber matt, or some other synthetic soft material) So, heads up there.
Overall, it is an excellet quality floor protection for the end pin.